My summary
For starters, I like the concept.
Level design, the levels look like they were constructed for a smaller character. And due to this factor, the ability to phase through ceilings is constant. The character has no actual contact other than the bottom of it. He tends to go straight through the ceilings giving him no actual mass. That is probably the greatest down fall of it.
Other than that a simple platformer with a new twist. Good idea just needs a tad bit of polishing.
Needs a little tuning
As people have said before me, The art is well done, the movements are nice, its got a consistent style, and decent physics.
Though there were some faults I did find.
-As people have said it is pretty repetative, could throw in more obstacles to make it a little more challenging.
-The flowers? You get more points for those? I might as well just fire like a madman and whether or not they hit I'd still be gaining points. There should be a penalty of some sort, or a limited amount of shots, so you aren't obligated to go Rambo on the situation.
-Sure it has some nice physics. I played for a while, but after a while it all meshed together. Throw in some curve balls to make it a little harder. Even when I hit the blue guys, it really didn't make much of a difference other than slowing it down. May be something that stops the cannon all together?
Overall, its a pretty decent game. Has a good theme, but doesn't quite match other side shooters. When making a game, you need to see what others have done, and find a way to improve it if you are going to make a game based on others.
Very good
One of the few Defence games I can keep going back to. Btw defence is spelt with a C not an S xD. And yes Mindraker you can turn off the sound. Too bad you can't read huh?
Age 34, Male
Lawton OK
Joined on 12/14/08
Invisible Runner 
Pill Cannon 
Mushroom Tower Defense