The puzzles are great and dimensions are neat, but platforming sections are particularly disastrous.
The real con here is platforming sections: the first person view along with a really disastrous jumping make some relatively simple sections become as hard as Contra (okay, maybe exagerating, but many levels will have you replaying over and over because of one jump.
Checkpoints make this problem a little less important, but it will test your patience. Story could've not been there and the puzzles would've been the same, but the constant narrator and Ike and Dolly make for some smiles that diferentiate this game from others.
It definitely won't win awards and they definitely shouldn't make a sequel. It is nonetheless a charming and entertaining game for as long (or short) as it lasts.