In case you're not aware, there's a project called VCMI which rewrites the Heroes 3 engine to add lots of modern improvements, fixes and easier access to mods. Thought it might be of interest since you like the game.

As for other games, how about XCOM? These games are turn based so you should be fine with touchpad + there's plenty of time to think. Don't know what specs we're talking about but in case of modern revival, XCOM: Enemy Unknown should work without issues. XCOM 2 is slightly heavier but might also work.

You could also go for 4X titles like Star Ruler or Total War series.

Finally, there are turn-based RPGs like Knights of Pen and Paper - it's light and pretty fun (as far as I remember anyway). A bit simple but might be enough to spend some time on.

RimWorld! It's an absolutely amazing colony builder

Dwarf Fortress LNP is free and doesn't require a mouse 😉 It requires a special type of insanity to learn, but the rewards are WELL worth it.

Here is a video of a drainable/refillable moat I made.

The quick transitions are Z-axis movement, you can only view one full Z-axis at a time. Dwarves go down so you'll be diving into the depths of hell. Oh, and don't mine the mithril tube unless you want to experience "fun". No further spoilers. 😁

If you don't want to learn the ascii, LNP comes with a few toggleable tilesets you can swap between, I personally just prefer the ascii. Once you can see it, it's like being able to see the Matrix.

No mouse and like games like MaM/Civ?

Recommendation for slower paced, top down strategy game:

• GBA emulator and the game Advance Wars 2

Recommendation for hard and fast paced game (audio required):

• Crypt of the Necrodancer

Recommendation for story based game:

• Undertale (avoid spoilers, this game will mess with you, only goes for 4 hours per playthrough but you will replay it for the different endings)

Flash games.

I recommend Bluemaxima's Flashpoint if you want a hassle free way of doing it.

Myst

hmm, a surprisingly lack of mentioning of joining us moderately happy linux gamers. join us :) some games run better by 'magic'

Dumb question, why can't you attach a USB mouse?

~~Megaman 8-bit Deathmatch!~~

Nevermind I just noticed that you don't have a mouse. Uhhhhhhhhh. You could always grab a gameboy-advance emulator and enjoy some pokemon or Pacman Collection or Beyblade V-Force or Sonic Advance 3. Loads of classics that don't have overly complicated buttons. I bet you could emulate other old consoles too, the Sega genesis had a phenomenal library that should all be easy enough to play on a keyboard.

Full throttle remastered

Also, as a reminder since you mentioned HoMM3, HotA is a great mod, and the VCMI project hit 1.0 last year, I think.

Void Stranger, Chip's Challenge, and BABA IS YOU are all Sokoban style puzzle games with minimal performance requirements and no need for a mouse.

Siralim Ultimate is a creature collector RPG that will run on a potato and provide endless grinding, if you're into that.

The Final Fantasy Pixel Remasters of the first six games are all excellent if you're into JRPGs.

Dungeons of Dredmor if you like rogue-likes, or you could go old-school and pick up NetHack or ADOM.

Alpha Centauri with the Alien Crossfire dlc

Best 4x ever.

Assaultcube is a good FOSS FPS

Obra Dinn in amazing and doesn't need any power.