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(+1)

I really like your core loop! Using the palette to show gameplay changes is a great idea, too.
I'm also super impressed with your faux packaging presentation, that's a really nice touch!
One thing that could improve your Gameboy-ness presentation is to make sure all the sprites are pixel-perfect to the original resolution, it's most noticeable with the scrolling background being too smooth. You don't even need to change any of the physics/decimal values under the hood, you can simply snap every sprite's position when you draw them.
I really like the game though, great work!

(+1)

Yeah good point, I'll see what i can do to make that happen, however if i do the game might become slightly horrible to play as it is a fast paced platformer, Thanks for the great feedback though! :)