The nothing happening when I hover over the red circle thing happens to me as well as whoever originally told you about it. Perhaps its a Mac bug? That'd be what I'm playing on. Otherwise, good game. A bit harder when I'm continually strafing though.
I liked the challenge of it and didn't notice many issues or anything up until level 19. After a small bit of frustration with timing, I finally got it down only to have both blocks mysteriously glitch into the same room...
Screenshot: http://img165.imageshack.us/my.php?image=picture3xf5.png
Fix the glitches, and I'd love it.
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 "Two Rooms"){kind=icon}