Honestly,i thought it was a quite horrible game,the harder difficulties aren't even hard,the collision is HORRIBLE,and the upgrade system is extremely imbalanced.Has potential,but lots of things ruin it imo :/
You get your first star by reaching level 100.Then you reset to level 1 again and then have to get to level 110 to get your second.This pattern continues up til you obtain your 6th star,which from then on doesn't reset.
Why do people say completing 19 with the lightknife is hard...?I actually found it extremely easy,even easier than using some of the tier 3 weapons rofl.
The reason you can't save up evolves is because the size of your ship determines how much food you need to level.This is why when you save up at low levels that it seems to use multiple evolutions at once,the food you ate IS still saved up,however you just need more food :P
 "Enigmata")
 "Turn Based Battle!")
 "Diepix Arena")
 "This is the Only Level")
 "The Eternal Battle")
 "A Knight's Story")
 "YouKongregate")
 "Cube Colossus")
 "GT and the Evil Factory")
 "Speedrun")
 "Hexcelle")