Pretty simple, pretty fun, reminds me a lot of that old site Sploder that I played on frequently when I was little. Maybe this was an inspiration, who knows.

The reason it's not higher is because it's just too many levels (nine) and it gets way, way too difficult. At the point where I realized I wasn't really having fun anymore, there were still three levels to go. Came out feeling a bit disappointed. Would definitely like this more if it was shorter.