I highly suggest that you should change the name, because there is a level by that name in SRB2 already.
Adventure mode isn't really needed for this level. Adventure mode annoys a lot of people, since analog can be strange as well as homing. I also don't think that button in the beginning is needed. I was confused where to find it since the pillar blocked it. The arrow didn't help me figure that there was a button to find.
I thought it was strange that you had some of the green slime hurt you and some of them didn't. I would change the not hurting water to be regular looking water. That crushing ceiling with the spikes seems to come out of nowhere, so I really suggest removing that, or make it easier to know it is coming. I didn't get farther then that, but that is The level really needs rings.