I liked the exploration-based approach this took. I do think that while the map isn't too big by itself, the world curvature made it feel a lot bigger and made it hard to find the items I needed. I think it might also be the reason the movement felt jittery and not smooth? Not sure.
Additionally, before getting the last chest I somehow managed to fall through the map, and was unable to get back out because of the gravity pulling me towards the center, so I had to stop playing.
Overall, nice work! It's a shame this doesn't have more ratings :)