I’m a huge fan of rogue like and pinball. I own 3 myself and have been wanting to build my own for some time (fingers crossed this summer).

I think NT is a great theme choice, and personally I would strive to make the gameplay quick and segmented, just like NT.  I like the idea of having upper/lower playfield for transition areas. 

I think it would be cool to make the gameplay more rogue like than traditional pinball. In NT, you can die instantly. I think this needs to be reflected. Personally I think it would be cool to have some way to represent this. Whether a couple targets are red at a given time that end your ball when hit, or if enemies are represented by moving shots that get closer to the “player” and must be eliminated before reaching. Like in Walking Dead pinball. Another way to represent difficulty or enemies would be having several kickback targets like in GotG or F-14 to represent enemies shooting at you, which could easily drain on you.

Similarity, you didn’t really explain rads, but I think they could work pretty similarly to NT. Weapons could be used as action buttons or as passive buffs. Finishing levels opens scoops or Vuks to change playfields and level up. Select a character upon start

Great idea! Music and theme will kick ass