The idea of swapping timers is clever, and used well in the different levels. I would love to see more difficult levels and other twists to the idea that place more restriction on the player. I feel like there's still a lot of room to grow, which is a great thing. Things like a counter that resets instead of disappearing, more ways to stop one player to desynchronize both, bombs with other shapes than a circle...
By the way I really enjoyed the way you used the two characters at once, and used their physical closeness for the level design instead of them being completely separated, especially during the level with the bomb you have to time well between the two. Though sometimes it was hard to know in advance which character would start walking when, and to anticipate their movement speed and offset from each other.
The feedbacks are the audio are really cool too, and the tutorials and level texts are well done to explain mechanics or give hints without being too distracting.
Well done!