Very impressive entry! It is really amazing how you managed to put together all these different features. The game itself was funny to play and satisfying to look at, and the music was amazing, it kept me hooked the whole time. I loved that the soldiers turn into ghosts that hunt you if you do not put them down in time, that was the chef’s kiss.
I have a few points to mention. The game felt a bit slow at times, maybe a speed-up button would help solve that problem.
For a better game feel, when you click on a tower to upgrade or select a soldier, it would be nice to show that through an outline shader. You can find many free outline shaders on the Asset Store, and they really add to the overall polish of the game.
I also felt that the reindeer was a bit too strong and fast, even with the wizards slowing enemies down. Probably just a skill issue on my side, haha.
Great work! You inspired me to make a tower defense game, which I have never done before.