I'm a firm believer in "getting a game done" because if you tweak forever you'll never ship. So sometime you just have to "Let It Go!" (don't worry, Spooky isn't making Frozen pinball)
Here are some things I feel we could have done better:
1) Difficulty. It is pretty hard, and there's a lot of modes to get through as well. Should have either made it hard with shorter modes, or easier with deeper modes.
2) Dialog. There's too much. Needs less characters, a few less ghost bosses. Last check has 220+ pages of dialog.
3) Lighting. I agree it's too dim. Brighter graphics on PF would have helped (it's why Star Trek has colors and pastels instead of "space") and I still nag Charlie to put some spots on the ramps. More light colors in general would have "caught" more of the cabinet lighting when it changes for modes.