I like the concept, and I could see this being really good, but it just feels impossible. For the record, I got to the second screen and couldn't make it past, and I could only beat the first screen by running past the first enemy. The powers and punches just feel hard to pull off due to the delay of the power itself and the enemy's speed.
I dunno, I respect that this is your first game, but there are lots of things that just got in the way of my enjoyment.
You can't move both laterally and vertically, the special attack has a blindspot, enemies can stunlock you, it just feels unfinished.
Furthermore, the theme is barely addressed. How is this mutant unstable? Why is the title mutated city? Is everyone mutants? Why do they want to attack me? Why do I need to go to the hospital. I don't look injured.
https://sdkgames.itch.io/mutated-city