I really liked:
1D Chess, A puzzle game where you move your chess pieces and capture all of the enemy chess pieces, but it all happens in ONLY ONE dimension.
Only You, a simple puzzle-platformer with only you, and the goal. It get very interesting from there
Clumsy Clones, a platformer where you can't jump but in mid-air you can leave behind clones, small circles that make you jump to the air.
STAT, a top down shooter where your health, ammo, and money stats are combined into one.
Negative Nancy, an interactive fiction game where you can only say no.
And there are many, many more. If you need to play only one of those above, I think it should be Negative Nancy or else the next game, Waiting Room.
And also a game that wasn't created for the game jam, but fits the theme and is generally really cool: Waiting Room. I want to get you interested in this experimental game because it is really, really, cool. but I don't want to spoil it. Let's just say you have 6 minutes to spend in a waiting room. Will you read some books? Read a magazine? Play in the arcade machine, or listen to music? And does it even matter at the end?
Thanks for making this post :)
And you can also play mine here if you want to: Twisty Chess