Balance

- Zeppelin Armor reduced by 10
- Zeppelin Frost, Fire, Nature and Arcane Resistances reduced by 10
- Zeppelin Hp reduced by 400
- All enemies HP slightly reduced on Everlasting Summer 4 and 5.

Bugfix and resolutions

- Fixed a bug with music volume that caused it to reset on game start
- Added a new resolution - 1600x900