, I was able to test this beta out last night and it works on my GCW. I even set it to 60 fps, and for the most part its running a lot faster than the 32-bit colour version. There are some slow-downs here and there, depending on what's being displayed, and the music sounds choppy at the beginning of the race, probably because it's one of those areas with a lot of sprites on-screen.
The shadows are indeed the wrong colour, but it's not just on the trees. Even the shadow under your car is a different colour -- on my screen it looks more Cyan than Green:
I noticed that the car's cyan shadow colour is like this for most of the "zones", but there are some areas of the game the shadow changes back to grey. I didn't get to pinpoint when this happens, but there were 1 or 2 zones that it would change.
But other than these minor colour differences, the conversion to 16-bits is definitely running better, especially when you enable 60fps.
* one more thing I noticed is if you set the game to 30fps, it does not render. The screen just goes black. You have to set it to the game's "Original Settings", rather than the 30fps when you don't want to run it at 60fps. The hard 30fps setting seems to be broken atm.
Thanks a lot for you hard work on this. It's almost there!