A solid good short game, remind of those game like "Learn to fly" where you start off weak, do each run and upgrade a little, make you do slightly better thing next run, then upgrade again, do even better thing, it is a very solid proven game design.
Only complain is that its taking too long to zoom back to my starting point after each die. Else, not much complain except mayb a bit lack of depth, but should be pretty much expected for a 1 week game.