Very nice. Reminded somewhat of the Submachine series (though the first few in your series even more so). I'm a big fan of the point and click adventure, and it's always nice to see one that's truly put together well and entertaining.
One suggestion I might make is to eliminate the timing element in the game (the bonuses during the countdowns). I rather enjoy going at my own pace in this type of game, but that's just my opinion. I also liked the map feature, made it really easy to navigate to the different rooms. Also like the time-travelly thing