Update #7: Minor bugfixes

The image text might ring a bell to a few musicians but it's just a joke, the music of the game didn't change, I just had no idea what to write :D

This update addresses a few very small bugs we noticed since the previous one.

• Tutorial is not mandatory anymore
  
• Fixed confused trinity UI when firing the super attack
  
• Fixed reset local leaderboard button not working
  
• Fixed very rare case of boss warning staying stuck on screen
  
• Added more kickstarter backers to the in-game credits