I'm not a big fan of being lost and I didn't get far, but what I played was super polished. Movement feels pretty good, animations and visuals are nice, music is good and fits well. I think the camera moves a little too hard, and doesn't seem to accommodate vertical navigation. I also didn't see anything really related to the secondary theme. Feels like this isn't far off from a complete game. Great job overall!

Wow, what a solid game! This feels super polished and perfectly like an actual gameboy game. Also really nice art and the enemy designs and music! If I had to critique one thing, it may be that it’s a bit too standard of a metroidvania. But that doesn’t even have to be a bad thing and it’s of course all made in limited time, so take that very lightly. Surprised it wasn’t rated more yet. Probably because it’s just for download. If it’s possible for you to provide a HTML version I’m sure many more would play it. :)