I had a hard time to make it work, but it's mostly because I'm not used to bundler, which seems quite efficient to package games when you know what you're doing ! :)
The game looks really cool, I like its visuals a lot. I didn't have any sound ? According to the media folder, I guess there would only be the ball sound though. The game is mostly smooth on my laptop, some freezes happened a couple times. The ball got stuck a few times too.
Got to the third level, I like those text popups. It may have been pleasant to be able to validate them using the enter keyword since the mouse is not used anywhere else.
Good game ! Thanks :)