Can be better
The graphics were the same.
One background that does change if your cannon moves over it, wheels don't even spin and when you get hit it doesn't show. The same same poof of fire.
The gameplay was okay...It's sort of hard to look the top of the screen when your cannon is so small, and then you suddenly notice you're out of fuel. The "Power" charge doesn't make a lot of sense either...
It could be better. Better graphics or animations. Maybe make a bar that shows the power, instead of the number and an actual projector sort of thing showing the angle. I mean yeah we can sort of estimate where 24 degrees is, but it'd be better if we had an arrow.
Keep drawing and making better graphics, working on it, it'd become a pretty decent game.
Oh and also, the black with dark grey for the title, not a good choice. Was VERY hard to read what you wrote.