It seems like a fun level, what bothers me is that you can camp the top two rooms without any risk, including the seek PU room. I also find seeker PU a bit overpowered for such a small level, if can camp the middle or bottom area your seekers can reach both vertical edges of the level. The good thing is that you can stop the campers in the middle by shooting through the one-way.
Spaz has a bit of advantage by being able to jump to the platform quickly before his copter disappears. Also at the end of the vines you fall (36,69 for example), it shouldn’t be like that since it looks like you would still be on the vine. It’s also quite easy to get stuck by jumping to 28,53 or 29,53, happened to me almost every time. Get more people to test your level before you upload it, it should be easy to find bugs like that.
About the eyecandy, I would like to point out that if you’re playing the level for the first time, it takes a few suicides to learn where the ground is solid and where it’s not at the bottom, unless you’re playing on low detail. Eyecandy shouldn’t be used in a way that would confuse the player, since it doesn’t add any extra gameplay.
P.S. Shelly rocks