Here’s some impressive stuff I did:

• A portal gun that allows the player to create at most two portals on almost any surface
• A pellet receiver that opens the gate when catching a pellet
• Turrets that randomly move around within a certain range and shoot at the player upon detection
• A 3D audio system that follows physical simulation (audio volume changes with the distance)
• Interaction between objects, such as collision between turrets and actors being killed or activated by pellets
• Teleport through the portals and the corresponsive matrix transformation & in-portal image
• Built-in timers for state transition of certain objects