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.