Bug fixes and other things

This is the seventh in the series of weekly updates documenting the development of the game Where IsLand?

Features added:

• Added sound to the submarine's missiles
• Added a how to play section
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  • Now you can learn what to do
• Redesigned the HQ
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  • A larger base more suitable for the last holdout of humanity
• Added names to the leaderboard
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  • Now you can see who you need to beat.

Bugs fixed:

• Fixed a bug where the tooltip stays visible after the thing the mouse was over disappeared
• Fixed a bug where the sea monsters were unable to attack the HQ building
  
• Fixed a bug where buildings were able to be built on top of other buildings