Really enjoying this implementation of Gaia Project - a real sanity saver during lockdown!
One small gripe that is apparent when playing asynchonously is Power Income management (when power options are available after an opponent builds). The current implementation requires that income be decided in turn before the next player can move. This can really impact the flow, especially when players are spread across timezones.
An alternative option could be to save those power choices to be taken (in order) by each player before their next turn.
This should be optionally because choices would be influenced by what else is available to you but to improve the flow of an async game, it is a choice I for one would be happy to take.