I really liked this up until the rocket chimney area. First of all, going back and forth between those two sections is kind of annoying, and second, evading the rocket on the way down is a pain, even more so because it has to be done twice. The problem with really close calls like that with rockets (and most other enemies, for that matter) is that due to the way N was programmed, the rocket will sometimes fire immediately as you enter its line of sight, and other times quite a bit later. The moment when the rocket is fired isn't in the player's control, and this makes it frustrating.

Aside from that, though, this level was very enjoyable. If you change that rocket section a bit (I would suggest replacing the bottommost locked door in that chimney (the one whose switch is farthest away) with a normal door, to make that section a bit easier with the rocket whilst simultaneously reducing the pointless backtracking), I'll rate this highly. It's ultimately up to you, though.

NR