Tedious
The concept of the game is nice and all, but I found that there was too much reliance on movement using the cannon. Even moving side to side is hard to do without a shot and sometimes it would throw me when all I wanted was a small boost. The cannon wasn't too useful when items get stuck in a corner and I had to rely mostly on luck or rapidly clicking to launch myself or get the key to the door so much that my hand got sore and I gave up halfway through. I'm sure some tweaking to the physics could improve the game, but as is the game isn't going to be finished by me.