Thank you for submitting this to my stream ! It's a joy to play, very smooth. The only "minor" detail I could see is the balancing (spawning of the crystals seems a bit low for a jam entry). However this is actually compensated by the fact they persist over gameplay, which means you can gradually grind to get them ! Maybe not the best design for a game jam format where most players lose focus after a few minutes, but nonetheless this is a very solid entry. The pixel art is amazing and I'm still confounded by the magic you've used to iterate so smoothly between the black and white, really appreciate this entry. Lovely !