I love the game, keep it up! And the bugs I've encountered during my last game :
1. Repeated terraforming improvements only work on population growth, but not on quality, that's still limited to 20% for most races ( and I didn't test improvement rate )
2. (and this is the big one for me) Something fishy going on with late game research. If I run the game on normal speed, research completely stops, even though everything else seems to work fine. There are ways to go around this, but they limit the user experience

3. I don't know if this is still a thing, but inside a nebula if I want to build more than 1 defense base, I have to wait for the 1st one to finish, and then start the 2nd one, otherwise the 2nd/3rd/etc gets blown into pieces.
edit 1 : everything is on manual, but every state ship I build is on autopilot when they roll out
edit 2 : is it just me, or troop bonuses from generals/locations/events really don't work? stuff like recruited infantry strength, etc...