Tomorrow I'm going to focus on a progression to early game to late game. I'm thinking I may make it like an old fighter game, like double dragon, where you defeat all the enemies in one area, then a hand pops up and points you to the right. This way, when you move to the new area, you leave behind the extra enemy bodies, and leave behind most of your skeletons. I think I'll also make enemies drop power ups that you can only pick up while dead, in spirit mode. Picking these up gives big boosts to your spell power for a short time, so it will be important to kill enemies while you're alive, then pick up the powerups while in spirit mode while dodging holy attacks so you can return to life.
Here's a video of what i've got so far.