Very nice job, satisfying amount of polish. I was struggling to get my head round the mechanics of it a bit but it's probably too late at night for a brain teaser. Also the unity loading logo froze overlaying the game so made it kinda hard to see.
Ouch, sorry for that, haven't found this particular bug with the logo during playtests. Anyway, thanks for trying it out, come back in the morning perhaps! We have hints :D