Back in March, Womp the Cat released their WAD named MEKANISM. Initially, it had 6 maps with an interesting, dark environment accompanied with, according to its author, orange and purple touches. It got updated about an hour ago with a brand new episode, along with some tweaks and a secret level made with the collaboration of Thelokk.
Sadly enough, the initial episode 1 message got wiped out for the second episode's release, but if you’re looking for stuff to try, here’s a really fresh addition. I will definitely try it out soon and you can read more on their project page.