This was really fun! It felt like I was able to keep up with the number of enemies as the game progressed, but they were still regularly getting close to my castle and just barely dying in time. The different towers all felt useful in their own ways, so I felt incentivized to use them all. The wave that was made up of a bunch of skeleton kings felt like a huge difficulty spike and ended up being too much for me, but overall I enjoyed my time with the game. Great work, especially considering the time limit! Difficulty balancing takes a lot of small tweaks and testing, so the fact that it's balanced so well up to a certain point is really impressive.