I have some issue with the Rocket roman, I think it needs more feedback for the player. Once I light him up, that's kind of it. I don't really see him at all. (I kind of understand the limitations of the current modding though).
When you enter through the big gates, it... somehow doesn't work for me. There's turtles running around and... yeah (would be cool to have a level design meet up to discuss and polish, ... [NOT IN **POLISH**]). The lock is cool, but are the enemies running at you? It's these little things that are missing. (I have more things to say for other sectors, but let's leave it be.)
Also, I very much dislike enemies in sector transitions.
The fights definitely improved since the first versions, but at places there's too many types of enemies. The jetpack romans are loud as fuck and don't really serve a purpose (I might really make that 1h long vid

).
There's slight imperfections with crates: when you climb on them, you can usually clip into scene nodes, view things you shouldn't.
This is just the bunch that I can point out right away. Maybe I just want the game to be something it isn't though?