Good fun! Overall a well made game. However, I mostly spammed the mouse button. It was hard to find a winning strategy. Sometimes it looks like the collission detection between the bullets and the attacker is not working properly. I reached level 6 before the aliens were sadly defeated by the eartling.
Viewing post in Mothership Defenders jam comments
The collision issue is with the bigger enemy ships? I made the hitbox a bit smaller than the ship to make it easier for it to dodge, but it doesn't actually say that anywhere :)
I also noticed that in the Advanced Mode there is less strategy, to correct it I had an idea to modify the spawn system to spawn different aliens from 2 or more spawn points but I wouldn't have made it time for the jam end. It's one of the things I would like to improve in a post jam update.