G'night Woider!
And I'll be honest Ecna, if someone like Arch can't develop a level-up system without trouble, then you know it's gonna be a total mess if I do it. Still, that's not gonna stop me from trying
Maybe we can keep it simple, give certain amounts of EXP for defeating enemies, and then just use doubled experience requirements for each level. (15 for level 2, 30 for 3, 60 for 4, and so on) If transformatives really come into play, we'll say they can change your stats CoC/TiTS-style. Also, leveling up gives you... lets say 3 more points to distribute to your stats where you want to.
And totally Aubrey! Glaives are freaking sweet!