Nice one! The game feels great, the bomb itself i feel is already pretty good. I think that the fact that you need to learn how to use it is part of the fun.
What I would try, is to add clarity of UI, and to make sure that it is even clearer what is the goal. Also, remember that failing is a key part of a game (especially hyper casual games), so push the fun in failing! Make some cool "death" animations or effects to push the game feel when the player fails.