Dang, this already feels like a full game! I'm seriously amazed you were able to crank this out in 10 days! I don't know if those animations were a part of your existing assets or not, but those were super smooth! Awesome job!
I really liked that the currency is also your health. Very neat idea, but definitely makes balancing the game and the difficulty curve very tricky. I really wanted to unlock the other troops, but I kept dying while the unlock cool down was going, since I couldn't spawn many new defenders!
Overall an absolutely fantastic job! I hope you keep working on this one!