Great concept, and great polish! I got 31.
My Critiques:
I wish combo-ing a bunch of moths had some benefit or acknowledgement. It's really fun to zap like a whole bunch of them in one go, but most of the time I feel like just meeting them one by one at the edge of the screen is easier.
I think the flashing screen effect should be toned down a bit.
Otherwise a fun game, good job!