I will not add anything new to what others have said - simple, addictive and very visually attractive. Cool for me. I got hooked and got to level 11 :D
I love that moment of risk when the "light" has gone out, but you're pretty sure what was the path, so you take one step, and one more, and one more, and PUF, nope you were wrong! :P
For the future - I think more content. Someone compared your game to Flappy Bird, and I think there's a lot more potential here to add some more mechanics (but not too much, minimalism serves this game!).
Somewhere in the comment you wrote that you want randomly generated levels. I'm not convinced of that. I think there is room for an interesting level design that cannot be solved by randomness. I like the solution that is now - that randomness is to mix up the order of pre-designed levels.
The only serious drawback for me is the size of the window - I need a full screen: P
Good job!