Doing a PS1 game. Started yesterday, got the camera working today. Haven't moved to using DMA for graphics yet, and I should probably get some quads in at some stage, and did I mention I'm not using the GTE (math coprocessor) yet?
I've got some game design stuff in mind and have been brainstorming it on my laptop on the train and it's got the potential to be a lot of fun. The concept is that of a parkour platformer where whenever you go through a window, gravity inverts and you end up in a dual of the level - if you've ever played a Flash game called Shift, it's a similar idea to that.