- Since there's not a whole lot going on perhaps you could animate those blue lights? (The far left side of the players view.) - Maybe animate the candles as well? - Have more going on in the projector? Unless that was intentional to be game similar. - It may cause some re-positioning, but you could crop those sprites since some are unnecessarily large. - Yeah, maybe I can add more anims. I stopped to work on this stage long time ago and just released the way it was.
- The bounds are uneven, I couldn't tell if that was intentional or not. - I've just used the image natural width. Its that a problem to be uneven?
For the bounds it makes your stage not symmetrical, which means that a player will have an advantage over the other at the beginning of the fight, since one of them can be cornered more easily. It's not as important on wide stages, but the stage should always be symmetrical (boundright = -boundleft)