This is really impressive for a three day game jam. It is really polished and a smooth experience. The art and audio is great, and the gameplay is a lot of fun. Well done!
I really like the horizontal, 2D tower defense. The gameplay is a lot of fun. I can see how additional levels could really up the difficulty and strategic choices. I also like how the fast paced music gives a sense of urgency, and I love that you used LOVE.js.