Harder Enemies, Better systems

Changes:

• New upgrade: orbital shields (they spin faster while shooting)
• All options now use vulcan for now
• Removed rockets (If I did leave them in the previous version)
• Big enemies are more powerful
• new bullet sprite
• bullets should be on top layer
• boss now has some testing patterns
• warp particles no longer have a trail since that seemed to be causing lag
• reworked how the pickup system works internally
• swapping weapons no-longer drops the old weapon

I think that's everything