I went back recently and updated the visual effects for the dwarf cannon turret. If you take a look at the old gif, you can see the projectiles from the turret make a barely visible light grey line towards their target. You can hear the turret firing, but you can’t really see it.
So, I went and replaced the projectile with self-illuminated material with a particle trail following it. Now the bullets are much more noticeable. It might not seem like much, but lots of little details like this add up to something great.