I never released a level, but I had a really fun one that involved numerous DEEP pits. Some acted like slides, which would safely take you to other areas (at incredibly high speeds). Others were nothing more than death pits, which were hidden (but not covered, so no silly walk through walls/floor stuff). The death pits were so deep that it would take about 2 minutes to reach the bottom, but that was part of the fun, as dispersed through the pit were random outcroppings. If you managed to hit one, you would die much sooner so you could get back to playing
There was even a "springboard" elevator to take you back to the top of the level in various sections, which would start off with a rapidly accelerating elevator, then it would stop, and a cog would launch you in the air, as if the elevator had acted like a springboard.
Never finished the level though, because as much fun as it was, I couldn't get over the crappy geometry
