A nice little game which I enjoyed! I think the balancing is good too, it takes a little challenge, but not too much, to reach the end. The art is fine (although the dog looks a bit big) but the music gets very repetitive.
Also, the camera should be a bit more forward than the player, in order to see obstacles before they shoot us dead (currently it is centered on the player/screen). I also understood only at the second level that you can shoot enemies.
Congrats for the jam!