v0.8.15 Update

We've fixed a few bugs in this release:

• Spiral Slayer now properly shows the buff icon on battle load (previously, it was present but not shown)
  
• A new attempt at fixing the Brick Slimes sometimes getting stuck and having animation issues
  
• Slime-only pegs now work with Swashbucklorb
  
• Peg Buffs now limited between -999 and 999 to avoid visual issues
  
• Fixed a potential memory leak issue with the new prediction system and Pierce orbs