This very well could be the best game I've played in the jam. I'm tied between this one and Golf Sunday. It is a flawless execution of the concept, and it fits so nicely into the 64x64 constraint.
The creator recommends you play with a game controller, and I agree. The experience is much better with one.
This is nitpicking, but I wish there were more of a strategy to avoiding enemy fire. I never quite figured out that part. The projectiles fly sideways, which makes it hard to avoid them if you don't have much room to move on the opposite side. If two bad guys fire at you from the left and the right, you're pretty much screwed and just have to take the hit.
I settled on trying to trap the enemies but I couldn't avoid enough damage to not die eventually.