I added the power-ups I talked about yesterday. Enemies drop mana power-ups when they die, and you can only pick up those power-ups when you die and are in spirit mode. To progress to the next area, you have to pick up enough power-ups for new enemies to stop spawning, then defeat the remaining enemies.

I also finally added the loss I planned on. Take too much spirit damage while in spirit mode, and you lose. Spirit health replenishes over time while you're alive. Die again too soon after taking spirit damage, and you won't have much left.