This game doesn't adhere at all to the jam's 84x48 pixel resolution constraints- pixel art is nonuniformly scaled and anti-aliased, objects are moved smoothly at "sub-pixels", and text and background graphics are much too detailed.
The control scheme is intuitive. Gameplay seems very repetitive and simple. If the enemies escalate in difficulty, the ramp-up is far too slow to be noticeable.
Sound would have been a nice addition.