Dead or Alive Beach Volleyball Xtreme 3

Slay the Spire and Darkest Dungeon can be played with only a mouse and you don’t need any reaction, maybe when you configure the overlay in the settings for the games it’s then playable with only the keybord. Maybe you can also play Dredge in the passive mode with only one hand and only keybord I havent tried it out with this restriction

One Finger Death Punch

If all else fails, Vampire Survivors.

• Patrick’s Parabox is one of my favourite puzzle games. Gets pretty crazy with recursion.
• Baba Is You, another popular puzzle game. I found it frustrating after a while but maybe that’s just me. And when you don’t get stuck it’s super fun.
• Sokobond is another sokoban game, but you said you like puzzle games and these lend themselves well for keyboard only play. Pretty chill overall but I found a few of the later levels pretty difficult. I also like how every level tells you a fact about the molecule you’re building.
• Thomas Was Alone is a classic. It’s been a while since I’ve played it but I think it’s playable with keyboard only. It’s a puzzle platformer, so you need at least some timing (not sure whether that violates your “no responding quickly” requirement) but it’s not very stressful. It also has great narration.
• Stardew Valley. Not for everyone, but the people who enjoy it often play it for hundreds of hours. I haven’t tried it but I’m pretty sure you can play it with keyboard only. You might need to rebind some keys and it might sometimes be suboptimal (e.g. can’t place items away from your character without a mouse) but shouldn’t be a dealbreaker.
• I’d also recommend checking out some classic games on emulator. Older controllers don’t have that many buttons so you can easily bind everything in a way that is easily reachable by one hand on a keyboard. I was thinking of Pokémon specifically but I’m sure you could make it work for a lot of games.
• A Good Snowman Is Hard To Build. Slightly frustrating controls (and there’s no undo button) and a bit short but otherwise fun. I also saw on SteamDB that it recently had a price increase from 10€ to 15€. I think I paid €2.50 for it on sale. So I’d say definitely only buy this if it’s at least 70% off.

A lot of people have mentioned Slay the Spire and it’s one of my favourite games, but I’m pretty sure that you can’t play it with just the keyboard. Controller could work one handed but it’s probably a bit too finnicky. It’s an amazing mouse only game though if you ever need to rest your other hand. Or just as a general recommendation.

This doesn’t really match you criteria, but if you’re open for something a bit different, I’d also want to recommend Trackmania. It’s a precise racing game that many people play on keyboard (including myself). I press the brake button with my other hand but you can easily play with just WASD too. I recommend rebinding the brake to space though for easier access. You don’t directly interact with other players, you only race against the clock. You can play the campaign for free (25 tracks and they change every three months).

I recently enjoyed playing yet another zombie survivors and it was a blast, cheap and at least a weeks worth of grinding to unlock all the goodies. Also you only need the WASD keys so you should be set with your broken arm.

The recently released Baldur’s Gate 3 can be played with one hand perfectly fine. Your arm will likely heal before you finish it.

Edit: just noticed that you said you want keyboard only, in which case BG3 might not be ideal since it’s mostly mouse based. I think you can customize it to play with keyboard only since it has gamepad support, but don’t know what that’d be like.

There’s no fast paced clicking required though, so you could try to adapt to left handed mousery if you really want to play that one.

Slay the Spire and Monster Train are great singleplayer card games that can be played with just the mouse.

Pretty much any turn based RPG is on the table, I can easily recommend Octopath Traveler 2.

You can also play story-driven games like Telltale games and Pheonix Wright, those are pretty fun.

Cannot view the link without signing in, but Peglin can be played with just the arrow keys and space bar as the minimum amount of keys needed. I cannot say whether WASD works, but it’s pretty simple to play.

Almost Any visual novel.

Caves of Qud is a really neat turn based roguelike that kinda focuses on exploration. It’s a bit hard to get into but if you do it’s really neat. Very very keyboard friendly, its my go-to game on my laptop.

It has difficulty modes that are… Less hard lol

Oh god I know too much about this. Long comment. Sadlol.

What kind of cast? Above or below the elbow?

I had above the elbow for 9 weeks once and below 3 times for 3-6 weeks on my right arm. Only below the elbow on my left but 5 times. My bones aren’t so good.

Above the elbow I played a lot of Warcraft 3(long time ago lol), Civ, AoE etc. Games that only required simple clicking but lots of hot keys to control. Above the elbow cast prevents a lot of you ability to rotate your arm so switching the mouse to your left doesn’t help much.

Below the elbow it depends if your thumb is immobile or not. If your thumb is free then it’s a matter of buying a cheap small mouse that will fit in your palm with the giant cast bulge. FPS and fast movements will be painful and not recommended but slower games and general use isn’t much impeded.

Immobile thumb is maybe the worst. Grab a cheap number pad and place it under your hand so you can use four fingers on the buttons. Mouse in your left hand. This severely limits what you can do with a computer.

Look up some brain exercises to ease the transition between sides of your brain and handedness. Also hold on to the skills you develop in these few weeks. Being able to work right or left hand helps with a lot of manual tasks with weird angles like using a drill under a sink or what have you.

I know you said your right arm is broken, but The 7th Guest (and the sequel, The 11th Hour, but the puzzles are very difficult) would be easy to play with your off-hand mouse anyways

just make sure you use ScummVM for them, because the versions that Steam/GOG are selling aren’t very stable

similarly, the first 3 Monkey Island games, or Myst/Riven