Yep I made a horrible WAD. It's GreenFlower Zone Act 1 with crazy stuff added. Also you start the level somewhere randomly.
The chaos emeralds are hidden somewhere, but I'll never tell.
Link: http://www.sendspace.com/file/ykmevn
Screenshots:
Starting Place.
Lots of Crawlas.
Lots of rings and Crawlas
Lots of rings Crawlas and (look closely) a Jettysyn
Rings Galore!
Attack of the Red Crawlas
More Crawlas and Rings
The chaos emeralds are hidden somewhere, but I'll never tell.
Link: http://www.sendspace.com/file/ykmevn
Screenshots:
Starting Place.
Lots of Crawlas.
Lots of rings and Crawlas
Lots of rings Crawlas and (look closely) a Jettysyn
Rings Galore!
Attack of the Red Crawlas
More Crawlas and Rings