I've added an updated build, based on your feedback.
= New features:
There's a restart button (r).
Better explanations of controls.
The ability to punch using Lshift.
A small map update, remedying a leap of faith. This shouldn't affect the validity of any speedruns. It's out of the way of the route used.
The "feature" of no longer being able to use up as jump. The game doesn't control well if you do, so I'd like to force you to use space.
= Other stuff:
I would've added a charge indicator, but the code wouldn't work with me, in a way I liked.
A webgl build was another thing that should've been created. The way the art was imported made this not doable, not without redrawing or segmenting large portions of art.
I don't wanna spend too much time on the project, so I wasn't willing to get my hands dirty with these things. That's not to say I don't have intentions of expanding upon this idea, in the future.