Extremely interesting premise for this game. I really appreciate the pad support, simple yet readable graphics and the effort that went into making it smooth, scalable chaos. The usage of the Newgrounds userbase as a generation of mook companions is an incredible idea. I actually had Tom Fulp himself come up and heal me before charging into the frenzied frontline, never to be seen again.
My one gripe with this at the moment is that, past the 10-15 minute mark, it turned into a hardcore idle game for me. Once the NPC infighting reaches the equilibrium there's nothing left to do but sit your character back and watch as the enemy healthbars slowly get bigger and inevitably push your army back. Basically I left the game running and checked every now and then, and after 1 hour I autonomously made it to top 3 of all time somehow. The game could instead just end with a boss - I saw there was one past the 1000 mark, but he just got deleted - The current "infinite" survival mode could be an unlock or a different option.
All in all, very promising work that feels inches from something groundbreaking. You totally could (and *should*) capitalize on this game concept before it gets stolen, it's a very fun premise that you can still refine quite a bit; more skills, on site constructions like towers, bosses, stuff like that. The userbase sampled mook generation could work on other platforms too; Steam comes to mind.