I'm going to nitpick, but it's only because I have no major criticisms!
Movement feels sluggish and floaty. I can see why; this makes aiming in the air doable. However, perhaps tightening up the player movement and slowing time while aiming the shard would work. Aiming with WASD feels a bit awkward at times. Maybe mouse aiming would be better.
It's too short! Haha, I loved it and I really want to see more. This is great. 5 stars on all fronts.