After completing the level design, the core game loop was remaining to be done. 

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Additions : - 
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Added a lot of new sound effects for various events. 

Added combat design. The player starts with a hitscan weapon and can acquire a projectile weapon in the mid game. 
Enemy Additions include a turret enemy and moving turrets on a pole, and a final entity (it cannot be damaged, but plays a role in game's narrative) 

Added destructible objects. (Indicated by crosshair turning red as mentioned in the previous devlog).
Destructible include enemies as well as plugs that lead to destroying the force fields.  Force fields have indicators that turn green to red when destroyed. 

Added particles with GPUParticle3D and using quad mesh with billboard enabled in its materials to give it a 90s effect. 
There are yellow, orange, blue, dark blue particles. 

Added two pickups, a plasma gun (acquired after killing the turret enemy as a reward) and a battery that charges 20 health points of the player. 

Added swaying effect to the camera in _physics_process function, since the player character had no animations (except the wheels which are not easily noticed). This added a feel of smoothness to the gameplay. 

Added cheats as reward for the player upon beating the game. 

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Optimization :- 
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Optimized all scripts to use _process function as less as possible and instead to rely on _physics_process for their physics, making the physics more stable and increasing frame rates on low end hardware. 

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Narrative Design :- 
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Added intro and ending scripted scenes within the game. The game contains a vague lore where player player character feels disconnected from everything. (No spoilers here) 

The game utilizes a crispy font that resembles older computer terminals except when the player is talking (or thinking in his head),
which utilizes different font (signifying that player is somehow different from the game world and may not belong or fit in there).

The final entity will speak in robotic female voice upon destroying turrets and force fields. 

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Changes Made - 
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Changed the font for better clarity.

Added message points instead of triggering messages from the trigger point of the level for guiding the player character.