Once I understood how everything worked I enjoyed my time with this a lot more. The early introduction to the game could use some edits. Your description says ZXC for the various abilities, but in-game it's ASD. I also really dislike movement on arrow keys, but I think that might be a generational thing or something - I'm seeing a lot of it this jam. Having a way to use either would have been nice but configurable keys in a jam game is asking a lot. Just consider us WASD users for your next project?
The way you introduce the blue crystals at first it's not clear that it's expanding your max crystal count when you pick up the item, because it happens around the same time as the shooting introduction (maybe it's even just before? I'd have to replay to check.) I took that as meaning the blue crystals were your ammo and spent my time being very conservative with them.
Cool concept, and once you get your head around how it wants to be played it's pretty neat. Good job!