First few minutes it was difficult to understand but as I kept playing it got better. The UI felt a bit confusing at first sight, with what was interactive not being very distinguishable from what wasn't. This was worsened by the fullscreen ver. not working very well (I was using Chrome). The music was cool but also became a bit tiring after a while.
Leaving all these aside, this game was impressive, I'd play a full version with progress saving : )