I really like this game!
I wasn't able to get to the end, quitting after accidently starting at the beginning one too many times, but dang did I want to! Love the tough as nails platforming.
I would suggest placing checkpoints more frequently. While its satisfying to overcome a platforming challenge, it can be disheartening to have to beat the same 3 because you keep failing on the 4th. That being said I felt pretty motivated to give it one more try.
Another suggestion, and this may come down to how troll-y you want the game to be, but I would set the boxing gloves to continuously fire at a set rate, instead of only firing when your character is in range. This way you can be aware that the gloves are coming and see the pattern before making an attempt at avoiding them. I don't like being thrown off the platform by an unexpected glove, or getting tripped up cuz the range calculation decided to throw 2 gloves at once. But again, perhaps this tolling is the point. Either way, I personally prefer hard but fair platforming.
Really excellent entry, the intro panning and commentator is a very nice bit of polish as well!