This game is brilliant. Fantastic concept and really well implemented. I love the design and animation. I got myself stuck by running away from my controls that I had placed in the world and even found a cool exploit maybe, (jumping and moving a box underneath me??). Either way I had a blast. One of the best games of the jam by far. Really good interpretation of the theme. Well played buddy!
If you're looking for ideas, perhaps you could make it so you're able to break keys which aren't made out of just one block (such as the space key) into smaller parts which you can then use in the world, then stick back together using a pickup like glue or something to recollect or use as a full piece again.