I was able to play the game by zooming in the page a bit in chrome, but you should probably adjust the settings for viewport dimensions to be the same as the game. The art looks greats, and I enjoyed the game at first, but the later levels really started to lower my enjoyment. There are a lot of jumps in the later levels that just seem unfair, and the button mechanic doesn't seem to work right. It breaks whenever you die and you have to reload the entire game, and when it does work I feel like I don't have enough time to get to where I need to be.
I am glad that you put in a level select and included the cutscenes, as it allowed me to experience everything the game had to offer, and the story was actually pretty good.