I just haven’t been very motivated to continue working on it - it would take a lot of work to get interesting flight physics, and adding gameplay elements such as enemy AI or aerobatics point scoring would be difficult.
I think it would actually be easier if it were possible to make this a two-player game, for example using the cable connection for PyGamer, since then there’s no need to write enemy AI code. However, last I checked this wasn’t working: Hardware Multiplayer (game) - #39 by jwunderl . However, it’s currently a bit too slow to work properly on hardware, so that may not be feasible even if that’s implemented.