Nice work, and nice getting to 20 ratings! :D It's is a good little tower defense game, and the assets and gameplay work well together. My one thing is the music proximity - it gets softer as you move away from the center of the field. I'm not sure what version of Godot you use, but you should be able to fix this by using an audiostreamplayer node rather than an audiostreamplayer2D node ^-^