First I gotta say I love the One Punch Man references lol.

I really liked the game and enjoyed playing it.

The music is catchy and not annoying to me.

Game play was solid, I think you need to give more incentive as to why you should fight the basic monsters because as it is there isn't much time to fight them or any reason too.

Flying, the noise being repeated over and over while flying was pretty irritating, funny at first but then lost its novelty.

I think it would be nice to have the ability to use either long range or close in both levels or in new levels.

The MP regens way too fast IMO. There's practically no reason not to use flying and to fly over everything with how fast it regens. Maybe have it slower but have monsters drop MP you pick up.

Honestly this game has its issues but they are aesthetics mostly. They don't take much away from the great game.

My final thoughts (rambles) on the game and what is good or could be done better are in the last 5 minutes.
https://www.youtube.com/watch?v=g-U0iLPuk2U