Hey, thank you for reviewing! Sorry about the bugs, I mainly developed the windows exe version and added the html version a bit last second.
For the clipping, I think it happens when you go from walking to running and get hit on the same frame, so the state machine behaves strangely. As for the slowdown, I think that's exclusive to the web version, maybe certain new instances of objects aren't getting removed correctly. Anyway, thank you for the feedback!