The core gameplay is solid, but the forced grinding after every level just kills it. It should just do like Earn To Die does; let the escalation itself necessitate buying new vehicles. The vehicles get progressively better anyway, so the work's already done; you'd just need to get rid of the ridiculous roadblocks. Having the car literally fall apart just because you want to force players to grind is incredibly stupid and single-handedly responsible for this being a poor game.
Found a bug. When moving blocks between layers, a character can get trapped under a block and pushed through, leaving them unable to reach their exit and the level needing to be reset.
The boss fight has a Kaizo Trap. If you don't kill ALL of the boss's minions, one of them will dive on you when the boss dies and kill you, and you'll have to fight the boss all over again. Absolutely unacceptable.
There is way too much redundancy in the puzzles. Many of them are just a previous puzzle that's been rotated 90 degrees, or had one more pixel added. I also think it covered every single possible way to make an image of a face in a 5X5 grid. Also, it's way too easy; somewhere around 90% of the puzzles are symmetrical, and several can be solved just by filling in the solid columns or other set number combinations. This game is just filled with meaningless padding.
It's kind of annoying trying to get all the triforces or whatever when there's no way to get straight back to the level select after a level. Plus having to scroll through the list every time.
Found a bug. If one of those wide blue sections comes right before a split, the track won't narrow properly, and you can fly right out of the open space it leaves.
Suspension of disbelief is one thing. Having individual named characters die over and over throughout the game is another. And having a character die from a single bullet after a level where the goal is literally to do that twenty times with none of those having anything resembling a permanent effect on him is a third and quite possibly also a fourth.
Also, it doesn't count as a twist ending if it contradicts the entire plot.
So... you wanted to add achievements, but wanted to put absolutely no work whatsoever into creating achievements. I mean, seriously, why are they there?
 "Slice the Box Remaster"){kind=icon}
 "Swarm Simulator"){kind=icon}
 "Zombie Derby"){kind=icon}
 "Parallel 2"){kind=icon}
 "Kick The Critter"){kind=icon}
 "Crush The Castle 2 PP"){kind=icon}
 "My Friend Pedro"){kind=icon}
 "Pixelo"){kind=icon}
 "Picross Madness"){kind=icon}
 "Once Upon A Life"){kind=icon}
 "Idleplex"){kind=icon}
 "10"){kind=icon}
 "Accelerator"){kind=icon}
 "PicTune"){kind=icon}
 "Battalion Commander"){kind=icon}
 "Human Chop"){kind=icon}
 "The Peacekeeper"){kind=icon}
 "Strike Force Heroes 2"){kind=icon}
 "New Splitter Pals"){kind=icon}
Sorry for the poor balance. Fix it in the new versions of the game. Thanks you!