First of all, yes yes and more yes. Give me more.
This gave me an instant throwback to minigame websites and arcade machines. While it's a simple gameplay loop, you've created replayability incredibly well. The sounds are fantastic, the characters have a good design, everything aligns really well.
One note, I may be mistaken, but I believe the jump sound plays if you press space in the air.
If this had one of those leader boards where you could only put in three letters, this would be the perfect arcade game.
I am struggling to identify points of improvement, what you have is so well implemented and all flows so well together that I can't fault anything. Fantastic submission!
My top score: 27,500