Fun game. Despite how it feels at first, it is actually possible to get good at this game and take minimal damage. I got to about 10k with still half of my health remaining after about ten tries, only stopped there because there was no need to go any further. I estimate I could get 50k if I put in another hour or so (this took me ~30 mins). The main thing is to use the down key, it helps you fall faster, which is crucial in stopping yourself from clipping enemies while falling. I wish the final sprite was a proper shirt-bursting with nipples though, it felt kind of anticlimactic after putting in all that effort for it to just be another ordinary size increase.
Also, as a note for the dev, the attack doesn't refresh sometimes even after you kill an enemy. Usually this happens if you attack while on a wall. Should be fixed. I'd also suggest showing a bit more of the right side, right now it's common to have an enemy or ledge not be visible until it's too late.