Update Notes for v1.1 - Bug fixes, improvements, and gameplay adjustments

Update Notes v1.1:

• Balanced out difficulty scaling by making it harder.
• Decreased movement speed for bees.
• Minor adjustments on upgrades.
• Added a cooldown bar for indicating when you can cast fireballs.
• You can now just hold left click to cast fireballs.
• Fixed bug where difficulty level gets stuck at 12.