I like the idea of obstacles that limit your movement, but it feels a bit unnecessary in some places. I liked how the music notes combined with shiny things in level 4, but they otherwise felt pretty meaningless. Maybe if the game had a timer they would matter? Just throwing the idea out.
Also, the fixed camera was really distracting, and I kept walking off of stuff I couldn't see. Especially since things interact past the "view" you're in, it leads to confusion and headaches. The concept's not bad, just a little under-utilised.