First of all, great dev concept. Liked the idea of such a collab.
The attack design is cool, however I don't see why you start with this type of randomized combo QTE, maybe it's best if you start with a simple hit on space and then find and unlock new attacks in special encounters (new creatures, bosses, etc.).
There's not much of a story going on, some side quests would do the trick. The motivation of main character is a bit vague, we don't get to know more specifics about him (like, say, monsters in Silent Hill impersonate the fears and deeds of the chars). But the gameplay is cute and it's fun to play, would be great if there were more content (level design is practically asking for it).