I really like the idea and the game!
I have a few small suggestions - add a restart button, allow the player to throw a bomb at all times (maybe destroy the bomb that is already in the level), but as I can see in the comments people already suggested that.
Another thing that I didn't see is the key binding. Why use shift for throwing a bomb? I had to go back to the itch page multiple times
The main thing I think you need to do is make the first puzzles both easier and also less repeating. In the first puzzle you get thrown to a situation without even being explained what's the mechanic of the game! I saw the idea and for some reason thought that the rewinding rewinded the countdown of the bomb, and that the jump it did was an animation for it. When I figured out how the game even works, the puzzle became easy but it's annoying to get thrown into something like that.
Then the next levels and especially the second levels are just repeating the same idea again. Since performing the rewind and being precise in where it lands isn't trivial, it can take some time, time where you don't solve puzzles.
Don't want to sounds negative though, I really like it, and the more advanced puzzles are really cool.