The boost crystals were my favorite. I'm a bit on the line when it comes to the gimmick of having to rotate yourself correctly to shoot. It's unique for sure, but I'm not sure if it's fun. Either way, a large number of enemies is great. That boss tho, didn't expect it, which was a nice surprise, but I wish it didn't have so much HP, it just became tedious at some point.
8.5/10 :D