Right-Click Fire Now Unlockable | Enemies Eyes Turn Red:
1. Starting cash is now $750
2. To unlock Right-Click Firing (Dual Shooting) you must purchase it in the shop for $500 on each level
3. Enemies eyes turn red when in close contact with player (working on improving later!)
Right-Click Fire Now Unlockable | Enemies Eyes Turn Red
Source: Steam Community (opens in a new tab)