I see you adapted the MP skirmish cav meta (aka destroyer of the worlds) to singleplayer, and 1 hit kills work perfect as well there
Jokes aside, i liked the music, although i prefer having at least some in-game sounds as well, i didn't mind the lack of it here.
Better PC config is a must, so you can run some graphics and camera mods and crank it to max, check for inspiration what others are doing, but i'm sure you'll get to where you want to.
Great start!