Thanks for your extensive feedback!
I'm sorry you had issues with jumping. I'm not really sure what you mean by the character not moving when he's jumping though. The character should move up a little and the sprite should change from the running animation to a jumping position. It's not really clear to me if it's not working right for you for some reason (is it a bug?) or if it's not pronounced enough?
To explain the rhythm part of the game: the mines are placed so that you have to jump to the beat (although you could probably do that on vision alone, as I tried to not make that too unforgiving). Also, (not sure how far you got, but) if you go a little further into the level, enemy drones start moving into screen that you have to aim at, at the right time so they will be shot down in sync with the music.
The music does change a bit, some synth arpeggios come in a bit later, and melody after that. But I'm no musician so I had to keep it simple. ;)
Do you mean the text only becomes legible once all of it is typed? If so, that's a bug, because that doesn't happen for me. :(