This is game is really cool! The art is very well done, only problem is it's hard to see since the game is rendered so small. Maybe making it bigger would help? I kept picking up items that I didn't know what they were for, since they were too small to see. It might be a good idea to add outlines or use a separate colour for objects that are interacted with by the player, to help them pop out from the background. The art seemed good, I just wish I could tell what was going on better.
The other main issue with the game was the lack of a tutorial. The controls are displayed on the main menu, which does help, but they're also hard to read because the window is so small. When I pressed K, it caused me to levitate and sometimes clip inside of things? I'm sure this is just a simple bug, but it had a sound effect tied to it so it was hard to tell. Overall, the movement had some strange momentum mechanics in the air, which made me cautious to switch gravity, since it felt hard to control. It also might be more intuitive to switch the function space and W, but that also makes me wonder how it would play on an actual gameboy, with a physical D-Pad.
I know this all sounds really harsh, but I can tell y'all really put a lot of effort in, and I enjoyed it! The aesthetics fit the theme really well, and the idea is great! It would just really benefit from more polish on the movements side, and a little more clarity on the artistic side. Great job! :)