I like the idea! It is also interesting how you can improve your time by placing several bombs in the beginning to minimize time spent on traveling. However that is harder to explore as it is because (1) the timer is broken and (2) It is not intuitive how the focus is going from one bomb to another - if I place b1, then b2, then explode b2, I'd like my focus go onto the b1, not the "new bomb".