Floor 1: I think Storm was the wrong choice. Sweeping beam is a great AoE (and you need damage for Act 1). The only reason it worked is because you got lucky with Creative AI later.
Floor 8: I would have picked Bullseye. You have lots of orb damage, and bullseye lets you take down important enemies earlier.
Floor 12: Both recursion and multicast are amazing here. Recursion helps you keep your dark orb around longer and multicast is just tons of damage. Even rainbow isn't a bad pickup.
Floor 17: Ectoplasm is way better than Eternal Feather here. You already have a decent amount of go…