It's a Kaizo hack i've taked 1 month to do and test. So there is some screenshots of levels and title screen!
Other Level Again:
This hack it's a Kaizo Hack but you need shell jump (common), p-switch jump, and a shell jump without a wall (I do this shell jump with frame advance). So it's this. I'm in mind continue this project, in Mario's Doom 2.
Download link: http://bin.smwcentral.net/u/25412/Mario%2527s%2BDoom.ips