I couldn't play on the website so I downloaded the windows file to play. Overall its a good game but I can't find the theme (ignoring the enemyrewind buttons). Sound would have been a nice touch to the game like this.
You should try for future jams that your game includes as a mechanic the theme of the jam. Also, if the game is infinite until you die, if you add a point system that would keep players engaged because they would want to get a better score.
Overall, I really enjoyed the art and the game. Taking into consideration that it's your first game ever made, its very well done (no bugs, it's playable...). I would be very proud if I were you. However, I dont think it fits the theme because there isn't any game mechanic that follows the theme.