Original!
An great and original game. I like the sounds, and the text boxes too. But I have a few points of improvement for you. The first is that it may be better if you made more of a story instead of ''stuck behind a truck'' and ''getting some coffee''. If you do that, it would be more of a game instead of a link of puzzles. Another point is that it's better if you say 10 seconds before the bomb detonates ''detonation in 10 seconds'' or something like that. That way I don't have to look at the timer often to know how much time I have left, and that makes it more exciting too. A third way to improve the game is to make the quality higher. Not only because it looks pretty, but mostly to make the buttons clearer. Sometimes, on fields with a lot of buttons (40 or so), buttons that are the same look slightly different, so you can think they are not the same. My last hint is to make a time bonus. I don't know if it shows the time you was busy with the bombs at the end because I was too slow to complete the level with the letters, but I would like to have a score depending on the time collapsed and the amount of times you failed to disarm a bomb within the time limit.
Except for these points, it is a great game, and I would like too see more variations of games of these sorts.