Congrats on completing your first game jam! We also made a tower defense game, so I was excited to play your entry. I really loved the art in this game, especially the green radioactive brains. I almost survived wave 3, but still had 4 zombies left before I died. If you decide to keep working on this, it would be fun if the lab went through visual damage states as it's being destroyed. Overall, really impressive for a first game jam, especially with such a small team. Well done!