The music was alright, with quite some variety of instruments. However, you're using multiple artstyle at once, that don't go well together. For example the characters, ground, background and effects all look very different from eachother.
I thought that the two exe's were also part of lie in the game, but I guess that wasn't the case. I wasn't able to defeat the large skull on the left part of the first level. However, I did watch the walkthrough video to see the rest of the game. It isn't great that your game actually starts after a difficult bit, since this can prevent people from playing the part that the game is all about.
So far I've rated more than 10% of the games submitted and a lot of the games (30%) use the hidden platforms and obstacles lie. Obviously you didn't know that it would be this common whilest making the game, but that does mean that the game will be compared to a lot of similar games. I've seen three types of games: trial and error, reveal with the mouse and reveal around the player.
I would say that reveal around the player is the best way to implement this mechanic. So, well done in that regard. However, to me your game doesn't differentiate itself enough from similar types of games. Perhaps you can make the start of the game easier, so that more people can get to the part were you introduce the reveal mechanic.