Wow that was pure javascript? nice!
Very cool execution, cool animations, cool design. Have no idea why did I collect bones, but it was fun;)
I have not much to say. It was maybe a bit too labyrinth in design, I feel like metroidvanias work better in bigger zones. If You can just go everywhere all the time... idk, maybe its just me complaining. And it does make the traveling quick, so... Not bad design for sure.