Post-jam bugfixes

A few weeks down the road, one jam later and some new lessons learned, we're happy to add a few bugfixes to the game:

• More supported audio formats for game music, should keep the game from being silent in some devices
• A loading screen that waits for a first interaction so that iOS devices will start playing the introduction music at the right moment rather than indefinitely wait for first interaction before allowing sounds while the introduction is already playing.
• No silly screen rotation on desktop browsers