Build 31: some "balancing" + better stars

What’s new in this tiny update:

• reduced enemy projectile speeds, increased gargoyle movement speed
• the fake skybox has been removed, stars spawn in random locations and render like the moon

Hotfixes:

• bugfix: sometimes enemy markers showed up for enemies in a different area
• bugfix: sometimes fences didn’t go away after you killed every enemy in an area (but you could still leave by dashing through the fenced hedge)