Update 2

What I have done so far:

• buildings and obstacles for hiding and platforming
• an invisible border around the map to prevent falling off
• two green enemies that don't immediately target the player
  • one randomly chooses a point to run to
  • the other runs to each one in order (basically circles the map)
• invisible points for the green enemies to patrol to
• navigation mesh for the AIs
• two red enemies that immediately target the player
• all AIs stop at a set distance from the player
• green enemies target the player on-sight
  
• all AIs stop targeting the player after losing sight of them
  
• items to collect
  

Unrequired extra(s) that I added:

• Sprinting using Left Shift

What I have left to add:

• one red enemy can be distracted
• save/reload system with a delete save/new game option
• checkpoints with autosave