So not only do you not get to also see the "bad" ending after having collected every coin, the game also deletes your save, forcing you to start over from scratch, instead of just starting from the final level. That design choice along with the horrible level design deserves 0 stars, but I guess I'll have to settle for 1 star.
The way to get 100 % skill on any level, is to make sure the tars are killed slowly enough that there will always be tars on the screen until the end of the level. Otherwise the flowers are wasted when they fly out of the screen.
The second to last level being included in the game, with no checkpoints whatsoever, is enough to warrant this game 1 star. No badge is worth this kind of torture.
Absolutely none of the levels require any guesswork whatsoever. They all have a starting point that can be logically deduced. If you can't figure that out, then you're just bad at the game and should quit.
 "Factory Balls forever"){kind=icon}
 "Overlord's New Mansion"){kind=icon}
 "Decision 3"){kind=icon}
 "Tarnation"){kind=icon}
 "Medieval Chronicles 5"){kind=icon}
 "Greedy Mimic"){kind=icon}
 "Medieval Chronicles 3"){kind=icon}
 "Elephant Rave HD"){kind=icon}
 "black"){kind=icon}
 "Tales of Nebezem: Mind Trial"){kind=icon}
 "Medieval Angel 4 -My Uprising- (Part 2)"){kind=icon}
 "Unpuzzle"){kind=icon}
 "Medieval Cop 8 -DeathWish- (Part 1)"){kind=icon}
 "Mine of Sight"){kind=icon}
 "That Pokeyman Thing Your Grandkids Are Into"){kind=icon}
 "You Have To Burn The Rope"){kind=icon}
It's badged now!