Thank you!
If we're able to expand on this game later, a minimap is definitely planned. The screen space was actually designed based off the 160 x 144 resolution of the Game Boy but was up-res'd for submission.
It's true. Gameboy resolution is low and so difficult to include a minimap.
Another way could be, make another movement like crouch and displace camera to below. Because problem always is that you cannot see platforms down, but you can see it on the left, right or up.
If you continue the game I'll see it :)