I didn't get that I first needed to click on the level 1, and that I was just looking at a sort of video, not the actual game, getting frustrated at the lack of interactivity.
But once I got over that hurdle I the game I got to play was cute. Not the first thought that comes to mind on reversing roles in a tower defense, which makes this very unique, but also limited in its depth. All in all a great GameJam game.