Great shooter game! Among all the game jams (that I played) so far, this one has the best and smoothest implementation of the "rewind" feature.
Most game jam entries have either a story-based rewind, a "winding up" feature, a rewind that isn't really a rewind, or a very weird rewind feature. But this game has a very fluid rewind feature, that the player can control. Theme is definitely 5/5. Great job!
Only bad thing I can think of is that it is a bit too zoomed in, and the sound effect of the grenade is really funny XD.
Edit: Thank you for your kind words, btw, you made my day a little better :).