Awesome to see the game coming to NES. Played for a few minutes and noticed a couple things I hope can be fixed.
Jumping and landing into the bottom of walls kills you. Feels cheap.
Up also being jump causes a lot accidental jumps, which leads to deaths, especially coming off ladders. So I hope only the A button will jump.
Overall feels a bit weird that Up or Down goes into the ladder animation everywhere, but that's more of a polish thing. But Down doing the ladder before ducking is unintuitive, even if B ducks as well.