You know, at first I thought it was awful, but then I saw that the other powers were pretty cool, along with the teleport, and the shield, needs more content, and better interactivity, less repetivity. 4/5 for hopeful improvement.
Would be nice if you could access the trophy room, as well as the bestiary, from the in game pause/ upgrade screen. Also would be nice if you could see the current stats for your upgrades ie: piercing and critical hit chances, health regeneration speeds, and the others.