Resetting your skills is free and very usefull to finish off some levels you just can't get that 5th or 6th star for, reset your skills and buy everything except the money tree!
+ if you don't want to get frustrated on those last stars!
Idea: as someone else said: find sponsers, make it a console game in 3D with quests like any other RPG, 3D space battles and you got yourself a superb game rated 5* and favorited!
I'll go straight to the point and cut the crap:
I hate these kind of flying games, but damn, I love the dialogues, Im just playing for the dialogues :D