Love the Idea, Only thing I would add in future games is to add WASD movement aswell for those with 60% keyboards and for accessibility purposes. Swapping the block surfaces was really smart and I congratulate you for entering :)
I considered adding WASD support but couldn't settle on a good set of keys for jump and swap since Z and X are inaccessible when using WASD. Maybe Shift and Space? It's definitely something I'll be adding when I do another pass on the game in a week or two to add things I didn't have time for during the jam.
Thanks so much for playing!