Crazy game, I kind of struggle to properly review this one. As a whole it's a very good, maybe a little simple platformer, with a fun portaling mechanic used for puzzles and platforming challenges. The jumping and immediate portaling to effectively get extra height is a very cool mechanic I quite enjoy. While very well designed, its adherence to the theme is a little weak, BUT it IS a freaking gameboy game. I don't know how these are made (and I can't imagine it's particularly easy) but the aesthetic matching those of a gameboy, on top of being playable on an actual gameboy, is incredibly impressive, but not something I can easily rate, so my numbers might be skewed a little higher for that alone. Still, I quite enjoyed the gameplay of it!