Where should I start? Well, I'm a big fan of JonTron, lol. Well the mechanics are satisfactory. I like how the graphics have a 2D and 3D perspective at the same time. I'm glad you gave people the option to either use W,A,S,D or the arrow keys, because I'm not good at controls with letter keys. The game has a decent amount of challenge, it was addicting, it ws short but the gameplay is so great that it's worth to play more than once.
I'd like a link for the soundtrack of the game, really good remix I must say.
My final verdict is 5 stars. I have found no flaws. Sure, there is more space for some improvement such as expanding the game with more power-ups or upgrades but the game is perfect. The hit-detection box has no problem, satisfactory controls as well as graphics. There's little to no lag and thankfully no bugs. Good job. Jon needs to be aware of the existence of this game, I'm sure he'll have an eching blast :P