An enjoyable play, took me back to the old days of power-ranger games. The cool emotion of being a extremely OP superhero, absolutely destroying thugs was definitely there.
Got myself this sweet score before the WebGL build started dropping frames very hard, unfortunately - I suspect a lot of things started spawning offscreen.
Stuff I think may use some improvement: the enemy spawning - I saw this feedback given below, too, so I'll just mention it here. I also think if the base attack was a bit more linked to the idea of scaling, it'd be cooler - the GiantDama and LittleThingerer are cool but sadly its cumbersome to use them when I can just brainlessly shoot and pawn most enemies with the normal bullets. Instead, if they were more frequently usable, and shot out, say, automatically every time they were up - giant enemies would crowd spaces, leaving less room to escape but also helping you by blocking others, whereas smaller eneies would be harmless and easy to weave away from... something to think about.
All in all, very cool submission! Thanks for the trip down memory lane. Cheers!