Oh yeah, both TLA and 0AD are using the same engine. But TLA will have differences in gameplay. I say look through both 0AD and TLA to see what game will most resemble yours the most in gameplay. As for Uliginosus, everything's cool about it except for the trolls. For a race where some can be turned to stone in standard fantasy, trolls seem out of place in a largely organic civilization, unless your trolls will be different from what we think usually of them.