Good

The layout, graphics, and presentation aren't snazzy, but they're still very pithy and mathematical, so that's not a problem. The gameplay is good, but it's a bit short. Not enough levels, and there are no enemies. Also, as Keru said, the physics aren't too good. The jetpack, for instance, should alter the gravity variable of the player, not the Y value. Also, when the player fell, the acceleration of the drop wasn't properly oriented.

sweet and short

it was very good

tip. space is jump.

...

it was not as good as other games lol

Decent

A decent game, good graphics and concept. Good job.

Awesome!

that took me a while, but it was really fun.