Shitty IA (sometimes it doesn't even move, for example after paralysing you), too little quantity of levels (made too repetitive), annoying jump when there's a tile just on top of you and, last but not least important as all those flaws: interesting way to keep the player addicted, sprawling an enormous quantity of stuff to collect, thought non-sensical to be collected :D And I know this will surprise you, after all those critics: 4/5 stars. (I tried to critique constructively)
Sometimes, what I did on the past to achieve my goals (reaching the end without touching my "ghosts") clearly made a f*cking mess to myself when I did re-run over those past actions. I was telling myself "why the hell did I have to do this? what the hell was I thinking?" <-- and the magic of this game is that this is something we can also tell about life itself. :D 5/5
i finished the boss without any care about the HP, just moving around attacking. with that, i achieved everything and unlocked everything. and everything i unlocked was the same thing but with other colors and sizes...