I managed to get to the boat but I only needed 4 of the embers. It was confusing at first, but I was able to figure out the puzzle after exploring a bit. This was actually very fun and well designed, I really enjoyed my time with it
My only issue with the game is the graphics. I get that you were going for a hyper stylized retro/psx look but I think you went too far with the vertex snapping effect, and the lighting was just a bit too dark. I think the graphics got in the way of the gameplay. I accidentally fell off the map a few times because it was too dark to see the floor or the wobbly platforms threw me off.
Also, I think you should make a web build so more people play your game