So I'm stuck with a keyboard for a week or so, and I'd like to play something..

I tried CrossCode (EDIT: I accidentally wrote chrono cross, which is not what I meant) last night, thinking it'd be a snes style game that doesn't require analog aiming, but I was wrong about that :(

Oh and I really want something Linux-native, thanks.

Do you have a mouse? If so pretty much any made for PC game should be playable. It’s only the more recent made for console games which have difficulty understanding M+K. First person shooters are a good example, M+K every time. Anything point and click as well, mouse only. I mean your going to have to narrow it down just a tad.

Trine 2
FoxTail
My Brother Rabbit
Hero-U
La Mulana
Bastion
Regalia Royal


according to my gog profile these should fit the bill.

Old EGA/early VGA platformers don't use the mouse.
Jill of the Jungle (free)
Cosmo Cosmic Adventure
Secret Agent
Crystal Caves (not on sale)

Teslagrad is keyboard only. (Good sale discount)

I wasn't a fan of it, but VVVVV uses only 3 buttons on the keyboard (left, right, flip)

Puzzle games like CLARC or DROD, and platformers like Escape Goat?

GOG only?

Yes please, though I'm ok with checking out free & open source games that are not on GOG. Just keyboard for the time being.

I mean I wrote keyboard only in the title. Sorry if that wasn't clear enough. (Fwiw CrossCode should play just fine with KB+M but not with KB only)

Bit.trip runner games

Door Kickers: Action Squad! fun old style action with plenty of content.

maybe civ 4 beyond the sword
c64 emulated defender of the crown i believe was all keyboard; gogs amiga version one though uses the mouse for jousting and fencing though.
Um aqua kitty milk mine defender or broforce/ spelunky even.

Steamworld Dig
Super Hexagon
To the Moon (I think... Haven't played it in years)

So how do you manage to do anything? Are you just bashing everything in through command line? Try some text based adventures:
http://textadventures.co.uk/

Raptor Call of the Shadows
Doom
Duke Nukem 3D
Any pinball game
Old arcade style racers like Screamer and Moto Racer
Might as well try any DOS game

NetHack (or any other ASCII roguelike)
Any of the games in the bsdgames package (also rogue, which is found in bsdgames-nonfree)

For something more modern (that's on GOG), there's Tangledeep. (Not to be confused with Tanglewood, which is really a Sega Genesis game (GOG version is just the ROM packaged with an emulator), but it should be playable with a keyboard.)

Also:
Ultima 1-5 and Might and Magic 1-2 have only keyboard support, and Ultima 6 can be played with just keyboard. (Nit sure if MM3-5 can be played keyboard only.) (They may not be Linux native, but they run well in DOSBox.)

2D platformers are also often playable with a keyboard, including Shovel Knight, Cathedral, VVVVVV, Celeste (not on GOG, but available DRM-free and Linux native); the only issues are the rare game that uses analog aiming (Owlboy) or games that require lots of simultaneous button presses (Guacamelee).

I could also mention Undertale, but I've actually had better luck running the Windows version in WINE than running the Linux version. (In fact, even if playing with a mouse or a controller, there is one part where the game asks you to get out your keyboard.)

Many later DOS games, including Ultima 7 and on and the early Elder Scrolls titles, do require a mouse.

On the other hand, I remembered a few other games that work keyboard-only:
Bard's Tale Trilogy
Dragon Wars
Wasteland (not Wasteland 2)
Elminage Gothic