Was surprised to see RTP assets in a Unity game (which I think is against the RPG Maker TOS for both free and commercial games, but it's probably fine just being a jam thing), and I thought the combination was interesting. However, the bullets and boss movement/attack pattern felt pretty bland, admittedly. The shot type crystal combo mechanic was probably the highlight of this game, and I'd totally play a full STG which had combining various gathered shot modifiers as a feature.