It took me a few goes to figure out how everything worked (in particular the squares which appear on the clock killed me a few times before I realised that was what they were doing), but once I got the hang of it, the game worked really well! Fantastic work combining the theme and limitation into this; the hands of the clock acting as guns worked really well.
It would have been cool if things stopped moving/flashed/shook/something when you lost (I think this is one of the things that made it take a while to work out what made me lose), but that's a minor point. A small tutorial or introduction (or even just some text on the game page tbh) could really take this to the next level. Great work!