Interesting idea, and towards the end I found myself using the rewind button a lot, so it didn't feel like a feature added on last minute so that it would fit the theme. It does feel a little bit limited in strategy, as I was using the same towers early game and late game. Something that would be really helpful is if the health was displayed on the enemy as well as how much damage each tower does. Overall, I found it to be a short but enjoyable game. Nice job!