Infestation

My modifications:

1. Slide: The player can slide by pressing the SHIFT key. This allows them to have more maneuverability.
2. Made guns all use reloading and their magazine is shown in the UI. When the gun reloads, the UI shows this. 
3. Added hit effects to make it clearer when the player is hit. Similarly, there is an effect for when the player dies
4. Added a shield for the player that recharges when the player is not getting hit. The screen changes when the shield is up or not
5. Created 3 designed levels
6. Added progression in the form of player levels. When the player defeats enemies, they get exp. When they reach a certain amount of exp, they level up, allowing them to choose upgrades for their guns like fire rate or reducing its spread. This continues throughout the levels so the player keeps getting stronger.