Hi! The trick is to spawn knights as soon as you can, don't wait for the wave to be over, as soon as you kill someone and get 25 gold, press Q and spawn them next to the fight to help others.
Still, you'll probably manage to have fun in like 4 or 5 waves, then you can just spawn knights and win. As I said in the rest of the posts, the art took me too much time and I didn't have time to properly balance the economy so you either die in wave 2 or live forever spawning knights haha.
Still, thanks for playing!