What a gorgeous game! I'd personally love to see more challenge in the game. I was surprised there wasn't a more significant boss at the end. I might try a single familiar life challenge (reset if a familiar dies) - should be doable as far as I can tell.
I really like the clean artwork and the monster variety. Monster AI was mostly very good too, though I found the melee ones bugged out and didn't act sometimes. But the ranged ones were so much more effective anyway :)