I really enjoyed this hack. Simple straightforward level design. I especially liked the level based on the vine level of Kaizo 3 and the jump from P-Break of Panga.
The hack has a few tiny breaks here and there(and some shells which I didnt even need?!), but mostly fine here. Though in level 4 is a pretty big break which allows the player to skip the whole level.
You can use the shell and the turn block to get on the top of the level and and skip right to the end of the level. Ether puting mucher on top of the cement block towers or removing the turn block should solve this though.
Also good job on the boss fight. Coming up with fresh boss room ideas is always hard.