Okay - here’s what I've been working on (while I should have been doing other things) for the last fortnight! It's called Vulkan, and is going to be a Doom mod about a UAC geothermal power station that's accidentally drilled into hell.

http://www.teamouse.net/games/gzdoomvulkan.zip

To run it, unzip and use either of the .bat files included to set it up automatically - you will probably need to do some extra ZDoom configuration to your liking. This prototype contains one level.

It's designed with the firepower of Brutal Doom in mind but is still fun without it - and if you'd rather wander round and invite zombies to tea rather than shoot at them, I’ve included an alternative launcher that removes the monsters and just lets you explore and pick up coins.

That ZIP includes all requirements to run it including GZDoom and IWAD, which is generally regarded as in bad taste - therefore I’ll remove it soon and just keep the PK3 file up for use with an installed ZDoom:

http://www.teamouse.net/games/vulkan-proto.pk3

I’ve been amazed at how far Doom editing has evolved since I last touched it twenty years ago - you get a full 3D editor instead of having to do spatial geometry in your head to work out what a room will look like, and it's had the same kind of enthusiast following as ZZT (and invites the same kind of madness through ZDoom’s scripting system). There’s something very satisfying about its engine that I can’t quite identify - that cusp of accessibility versus power.