Art, sound, and and music are good.
This would make a nice phone or free internet game.
But:
-The teleport back mechanic seems shoehorned for the jam, and the control for it is in a weird place on the keyboard.
-You have a graphic hiccup in the background on the right. A bush is cut in half.
-Your enemy projectiles blend in with the background too much and are hard to see/dodge amongst the action.
-The bat enemies were spawning on top of each other and staying in place in one of the play throughs I did.
-You don't delete the projectiles when they go off screen do you? If you fire them as fast as you can, they very quickly start to bog down the game.
Simple and fun concept, just some mechanical problems to fix.