Bug fixes along with some changes and added features.

Bugfixes:

• Limited the healing of the Radiating Blue item.
  
• Fixed Repair Powder not working as intended.
  
• Lowered the lag in the main menu after saving\loading.
• Made one of the Sledge Brute boss variations easier to encounter.

New Stuff:

• Redesigned the Sledge Brute and Miner enemy sprites.
• Reworked the defense system.
• Added a new ambiance track.
• Added a new interaction with the Miner enemy.
• Added an entirely new weapon.