This is pretty interesting, and honestly very polished for 48 hours! I got stuck once the dark clouds were introduced, but I quite liked the first two levels. My only suggestion is to work on the difficulty curve of your levels: let players explore one type of block over a couple levels rather than introducing new concepts each level. Even just one or two more levels with just plain blocks and clouds would have helped me really grasp what I was doing. Congrats on your first jam!