I like the atmosphere, but there are some bugs!
1) If I press jump while falling the start, it goes through the pannel,
2) For some reasons I wasn't able to jump anymore at some point,
3) It seems like there is not a game over check, so this means that I have to refresh the page each time I want to replay the game!
With these fixes I think that it can be a really good game!
Another suggestion is to choose the sound effects that match with all the other stuff in the game!
Anyway you did a great atmosphere in the game and this is not easy to do!