Almost everyone jumps after the Kaizo Light Badwagon, and I would also like to try to do something in this direction. This project "Fedora" was created by me to pissing off some future players, it also has the retry system.
I don't know how many levels I will make , I think around 12 levels or less depends on my motivation.
I really like this first stage! The way you used the SMM Bobombs is super creative, reminds me of the insane levels Panga was making for Mario Maker back in the day. Looking forward to seeing more from this project!
I think you were too generous in that room. You could tighten the timer so you must rush at all (about 8 seconds is enough), as the death blocks at your left serve pretty much the same purpose. But that's just my suggestion.