I found this level very frustrating, but I'm having a hard time articulating why. I feel like bullet jumping can be fun, but some of the larger gaps feel a little blind.
I'm really not a fan of the ice part in the middle. I eventually got through it without taking a hit, but I think the strength of this level where it is fun is in the platforming, and this kind of kills the momentum.
I found the secret exit! Unfortunately, this is a one-exit level on the map! It's still a good location for a secret, and this is late enough in the game that maybe it could just be a tanooki suit or something?