You changed Mirage Missile from scaling with int to scaling with will, but the stat bonuses for raising Mirage Missile are still dex and INT instead of dex and will, and the title for Mirage Missile still boosts int and LOWERS will, which makes the skill weaker. Please update the passives for Mirage Missile. :<
Enemies shouldn't auto-scale to your party's average level. Make them scale with dungeon level and act instead. The current system removes most of the rewards of actually gaining levels.
Every single one of the sprites are ripped from Tyrian. If Tyrian weren't freeware now, this game would be removed faster than you can take off your hat.