Really great stuff, it's pretty polished. It has a little Quake feel which is a good thing. Except it's more colorful rather than red and brown. I like it!
What I didn't like is that weapon feels weak. hitting things should give some feedback. Knockback, better hit sound, shaking, little bleeding, hit animation or something like that. It's like punching something soft as it is.
But yeah, it is my only issue, the controls are great, the powerups have some retro feel to it. Really awesome!