There needs to be some kind of benefit to excess exp.

[vatszero]

Currently anything that gives extra exp is just not worth it, you either max out your exp by just having a good run, or you die early, and I just dont think picking up a level 4 wisp to get a level a little early is worth it, I suggest maybe after level 5 either a certain amount of exp past that point will give you another random spell choice, or a level 6 that requires you to pick up some kind of bonus exp to get it before the end of the game

[Grandork]

The worth of maxing exp early is gaining access to the powerful 6 Skull and the extra Skull per Turn.