Build 30: The blood moon is coming...

What’s new:

• added a blood moon; it’s temporary programmer art, graphics will be replaced (suggested by Bernardo - thanks!); it’s only a decoration… for now.
• fixed a bug (hopefully): in the smallest level sometimes enemies spawned in the starting area
• removed some superfluous soverlap checks (minor performance improvement)
• all enemies projectile damage values are now doubled ;)