I'm actually getting quite excited now. I entirely agree with HopeDagger's comments in my last post and accept I am a low-down no-good dirty quitter but I'm feeling really quite motivated now I've chosen a new direction.
I wish the map editor was a bit more user friendly in a way so I could appeal for people to write some Udo levels, but I'm not sure anyone else would get on well with it.
Part of me hates to kill a project. It really does, but since I made the decision I feel like a weight's lifted off me so I think it was the right one.
I'll tidy Udo up and release it with the single level so it is at least in the Showcase for posterity.