Great game! I've played a bunch of similar games in the Jam but this one really stands out because of how simple yet fun is. Other games make too complicated systems with enjoyment bars and so and are difficult to understand. I think you made a good choice only having to make the hero survive. One thing i really like is that sometimes you can make the enemies kill themselves without the hero doing anything. All in all a great game really! I would love to see it developed further maybe with more mechanics that create more options but keeping the simplicity.