This level – the second MarathonMan level – was done in a day, basically recycles bits and bobs from actual MM levels, and even some of my other stuff. It’s a long level with only two checkpoints, but really emphasizes the marathon mentality. There’s a couple tricky bits, but you should be fine. All three heroes are playable and work within the level just fine.
On a sidenote, I enjoyed the editing in this sampler video, where the in-game music determines the cuts and transitions. It’s sometimes nice to do a smooth little edited thing every once in a while.
You can play the level here:
https://megamanmaker.com/?level=300828