Firstly, pits are too deep. I'd appreciate it if you raised them up and made the floor F_SKY1.
My only complaint is the weapon rings. I felt like the teleports were really unneccesary because they killed your speed and left you vulnerable. The other thing is how the weapon rings were on pyramids... That doesn't work. It's so easy to shoot someone coming up to get the homing in their back. Not good.
Also, you got to do something about the homing-rail thing. I enjoyed both of them, but together they really suck. I didn't like the bombring too much, though.