Nicely done!!! It was good that all the bounce and gravity felt natural. At first glance it might look like Flappy Bird, but there is much more to it. The ability to fire bullets to destroy walls is really handy.
Also I see that you went for a grainy look for your game. I am not a super fan for that but I guess it is a personal preference. Are all those assets hand made?
I enjoyed playing it. :-)