Version 0.3 for Root 666

We worked on a small hotfix update 0.3 from the jam version (0.2.1)!

• can quit via ESC now
• improved roots overlay (less annoying, more transparent)
• (maybe!) fixed a breaking bug with the mandrake roots' sound
• enemies can hit the player on slopes and stairs now
• witches don't throw a fireball any more when too near
• small UI effect when collecting a weapon

Addendum: Version 0.3.1 fixes a regression of the witches' behaviour where they would follow the player without ever having seen them.