Sooper fucking fun. Music and sounds are great, fit the gameplay perfectly. Deserves better art. Really had me hooked. I personally would smooth out the difficulty curve a little bit. Here are my iteration numbers for your reference (level 0-10): 2, 1, 1, 1, 1, 3, 9, 23, 19, 24, 100+. After 100 tries on level 10 I stopped. I got past both cannons three or four times towards the end, but then you put a hairpin turn in after that. Comon man, thats a dick move ;)
I love the super fast iteration loop. The concept is funny. Addicting gameplay. Improve the art and perfect the difficulty curve and you have a very solid game here.