Hey Drew! This game is actually very clean, and I enjoyed playing it a lot! The jump feels very nice, and the simple gameplay brings me to an almost hypnotic zen state.
I think if you were to continue working on this, you could make the controls even tighter--perhaps the longer you press, the higher you jump! The way it is right now, I jump the exact same way when I tap the space bar and when I press and hold it. Some more detail to the controls could really juice things up!
Overall, though, I really liked this! Great work :)