The idea of putting yourself as the final boss is awsome, I love that. I never found out how to use magic or change my team, which is a shame- was that a cut feature?
Magic heals you if you have enough power (the Blue bar that start filling if you use defense), the feature of making your team was cut because of time but still we succeeded to implemented the concept where every time you defeat a boss his minions add to your team making you stronger