There was a flash game on Cartoon Network's website that was better.

It's interesting how this was my first exposure as a child to what would be the proper "anime aesthetic" besides Dragon Ball Z, and mecha too. I'm not sure if this had japanese voices as well, but I wouldn't be surprised. At least it had english menus.

The game, from what I remember, consisted in a 3v3 team racing, where you have to defeat the other mechas in battles while still racing across a stage.
Never got too far with it though, I suppose it was hard.