Wow this is really nice both visually, and auditorily. The gameplay is pretty creative how you need 4 stacks of the beats for your towers to attack. I will say though, it was a bit confusing at first because I didn't know you had to have 4 of the same beats for your towers to attack, so I was spamming all the different beats to make a cool sounding rhythm lol.
Overall, good game it has a lot of potential as a prototype!