Needs balancing
This game is in serious need of balancing. All of the enemies seem to have roughly the same challenge, no matter what level you are. Experience comes far too easily. Enemies get HARDER when you go from Ultimate to Ultimate King level, at Ultimate you win 90%+ by just attacking, at Ultimate King you LOSE 90%+ unless you use high-level magic spells. Using potions seems to make enemies hit harder afterwards. Magic is too expensive to use, except the top spells. The HP sacrifice is a nice idea, but when you do 0-2x the HP lost as damage and your opponents have 10+x the HP as you, it's not that useful.
Please, get this BALANCED!