Brothers - Tale of Two Sons https://store.steampowered.com/app/2153350/Brothers_A_Tale_of_Two_Sons_Remake/

Gamepad required, but pretty dope and short puzzle-ish fantasy adventure about 2 brothers who go on an adventure to get medicine for their father. Bit of a tear jerker. Few hours at most for length. If you're not into somewhat somber (or downright depressive) subjects, steer clear.

Catquest https://store.steampowered.com/app/593280/Cat_Quest/

Kinda like topdown zelda-game, but with cats and obscene amounts of cat puns. About 6 hours ish, give or take.

Gunpoint https://store.steampowered.com/app/206190/Gunpoint/

Scifi-noir puzzle platformer, ish. Basically you infiltrate, steal info, try not to be seen, get out. You climb walls/ceilings, tap into buildings circuits to control doors/lamps/elevaters/whatever to lock/smack guards to avoid detection or downright down them. Absolutely banger electronic/jazzy soundtrack. Bit janky with resolution as it is 2d game, wouldn't recommend using anything above 720p.

Perspective https://store.steampowered.com/app/1109410/Perspective/ (free!)

Another puzzle platformer, but the platformer character is separate character from "you". You move in "fps", and depending on how you leave the "camera", that forms the path for the 2d platformer dude. Difficult to explain in brief, but if you check the gameplay video it should clear it up.