Just out of curiosity I tried to get this running on N900. It actually does, but I still wasn't able to get sound working. The closest I got was pulseaudio using half the cpu so the game crawled into a halt. But without sound it's playable like with the N8x0.

Since the game nowadays uses OpenGL, only version that works without a new renderer is the first version ever released. It's a bit buggy, but saving works so if you save often, you should be able to play the game. I made some changes so that you can save and exit the game without escape key using backspace. Also covering the proximity sensor emulates right click if you need that.

Since the game has no sound and is little buggy, I won't try to push this to extras. But if you interested in a good rts and aren't afraid to install packages from the command line and can handle possible crashes, feel free to try it.

It's big (uses around 60 mb), but it's optified so it won't take space from your rootfs.

Use right click, save as... to download it.

wz2100_0.2_armel.deb

More info about the game here.