the sprite work is great but a couple of problems i found in the game:
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if you go to the boss area you can't go back.
the jumping is a bit annoying, since whenever you release it, it instantly drops you down.
the wall jump is broken, i think you already know that, but even the jumping in the wall is tedious.
after i got the wall jump, i went back to the overworld and tried going to the right, it seems there's an area there but it's not complete, right?
the merchants confused me bcz i can't do anything with them.
the level design is fine, nothing to write about, exept the boss area that i talked about before.
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i think with some more work, this can turn into a great experience, good job!