I liked the fact the bombs stayed where you put them so if some explosions worked and others didn't you were only concerned with moving the ones that didn't work 5/5 :)
I like the game, would havbe got a higher rating than 3/5 from me if there was a save button and that I couldn't get my keyboard back once I had started the game. I had to keep pressing Ctrl, Alt, Delete and then cancelling it.
I like these sort of games, but after I a few minutes of playing I could tell I was starting to get a headache because of the flashing coloured boxes round the edge of the screen. If you insist on keeping these you seriously need to put a warning on this game for people who have light / photo sensitive epilepsy http://www.epilepsy.org.uk/info/photosensitive-epilepsy
"You breaked the code" should be "You broke the code". Once I'd got the code wrong the only way I could restart the game was to refresh the screen, would have been better with a "try again" option.
Played the game, both times managed to have 2 stars remaining but just couldn't see the others, may have been better if there was a hint button to highlight one.
I liked the overall idea but:-
1. The mouse kept scrolling out of the window as I looked round the rooms.
2. The screen size is too large, yes I know you can use F11 but I usually have other windows open at the same time chatting to people so I couldn't do this.
3. You're not told when you have found the difference so you don't know the game is over.
I don't think I can help you with that. Personally, I'm using Google Chrome.