The extremely low level of difficulty prevents it from being a good puzzle game, but perhaps more importantly it contributes to the strange lack of tension and intensity that should be very present within the game's scenario, best illustrated by the final "challenge." Although in my opinion the story goes one plot twist too deep, it's still entertaining to watch it unfold, especially thanks to the game's clever subversion of Japanese character tropes. But the non-notable gameplay causes it to leave your brain soon after it's over, and I doubt I'll ever play through it again. There's also the massive missed opportunity of the game not keeping track of how long it took you to complete each puzzle- trying to beat your best time would probably upgrade redoing escapes from just tolerable to actually fun.