Hugely underrated game. This was a pretty fun romp; large numbers of individually weak enemies is always a good FPS style that I enjoy (huge Serious Sam fan haha)
My only bit of feedback is that a lot of the weapons felt mostly useless; since most everything dies in one or two shots, the Assault Rifle seems to just be the go-to, especially since you can hold 999 rounds for it, and every enemy drops ammo/health pickups on death.
I especially noticed the shotgun doesn't fire a scatter of pellets, but instead just fires a single wildly-inaccurate bullet.
Overall this was a fun time, but could stand to be improved just a tiny bit in the weapon-balance side of things!