Wow! This was pretty well balanced for it being made in 48 hours! I felt like I really needed to use every tower type, and though the beginning was pretty rough, I was able to build up my towers to a satisfying point by the end and stopped losing lives a little before halfway through the game! I loved the pixel art, and if you were to go back and expand upon this with different maps, more enemies, and more towers, I would love to play it! I think you have a really solid base for a small, but fun tower defense game here! Awesome work!