You should probably have some pictures. Or at least a picture. Most people are not going to leap without looking!
It's competent. The upgrade system is a cool touch. The art is pretty cool.
Paradoxically, the gun upgrade seems to cause the gun to stop working after about five upgrades. Multiple rows of bullets don't stack on each other; it ends up shortening the range of fire. It also produces a quite screechy sound.
Congratulations on the submission!