For your next, game , indeed some original gamplay could bring a lot. Even more an FPS taking part in devil world with additional gameplay lik not only shooting ennemies, but resolving physic puzzles , some different gameplay phases would be great !
With your actual skill in lightmapping it would be great visually i think, without needing shaders on the level (or baked normal map on textures with lightmap on level) !
I hope the new collision system using Nvidia Physics will be here when you'll begin your new game. Caus it will be lot better to manage without problem all collisions of the game. Unity already uses the physic engine for all collisions !
