Small fix for the game, but should make things a bit more stable.

Fixes:

-Added fail safes so that you can't get negative Faz-Coins (and ultimately get stuck on the battle screen)

-Adjusted Faz-Coin spawn chances for all currently active enemies, challengers and bosses

-Reactivated event group for Mysterious Mine enemies

I'll keep a lookout for any more bugs that might've snuck in, while also prepping some extra content for a potential (and unexpected) event showcase.

'Till next time!