I would be lying if I said the concept was all mine! But it was a very quick turn-around from start to finish (5 weeks from start to finish). I was pleased when the sound all came together as that was a lot of work writing all the new sound system.
I've got a tool-chain fo sorts here, so I can switch things up quickly. spritefont in one tool, maps in another. Everything linked. It's just the code logic that needs the real work, plus the ideas. Didn't you used to used Blitz a while back?
I'm using MX2 which is derived from Monkey2. plus a couple of shaders as well - to get the spectrum single color effect - that way I only need to do the next 16 color graphics :)