A wave of enemies

A wave of enemies is an FPS game where the goal is to defend against hordes of monsters.
There are 3 types of enemies in the game.
With each wave, the speed and number of enemies increases.
Use a machine gun to kill enemies.
Break your previous record.
PC requirements:
Minimum:- OS: windows 7/8/9
- Processor: core i3
- Memory: 4 GB RAM
- Graphics: gtx 650
- Storage: 500 MB available space
- Sound Card: Surround stereo