Really innovative gameplay. Made me wish there were more levels to explore (which says a lot about gameplay value).
There are two issues that I've faced. One is that the browser version is too blown up and once started, isn't giving me any option to either zoom out on the browser or make it full-screen. I'm using Mozilla. Not sure if other browsers have this issue with it.
Secondly, there seems to be an input lag. At times the middle mouse button works as usual. Then at times it does nothing, and upon re-click executes two clicks at rapid succession.
Otherwise, awesome game!