Cool game! It was very thrilling to see if i could defuse the bomb in my first try (I couldn't but I did on the second). I think your game would benefit greatly from more stages if they give the player the same excitement I got when I was exploring the stage for the first time. Seeing your comment about coop gave me the idea to turn this into a mobile coop game, since there aren't any good mobile coop games and it would be fun to sit next to a friend and share the excitement :)
Also I love how the defuser gets angry and throws the tool back if you give him the wrong one.