Wow, almost feels like a full game's demo, not the gamejam entry it is! Would have loved a button to recall the shard, if you accidentally misplaced it. As there a quite a few situations where you have to guess and threw your shard blindly, I think the game would also profit from a bigger screen size or at least an option to scroll through the entire room like in Celeste. Lastly I personally found the character movement to be a bit sluggish after all, maybe speed that up slightly and than it's perfect! :)