Thank you for all this feedback! I was not sure if that highlight was the right way to distinguish obstacles... It turns out it wasn't. (^.^;)
I couldn't come up with an idea on how to differentiate whether an obstacle is destroyable. Maybe the problem is with their looks... Do you have any idea how to make it work? It would help even more. And once again thank you for this feedback!
I'll definitely tell VOD.Music you liked the music! If you want to check out their other songs, there is a link on the project page. :)