Games played that helped me with Core Game Concept:

-Splatoon by Nintendo 

- Galaga by Bandai Namco

- 2D Shooter Online https://yandex.com/games/app/179163 by Yandex

These 3 games have helped with come up with a core game concept. As a fan of shooting games, especially colorful ones, I was thinking what if we have a 2d shooter that the main objective is to cover the area as much as you can with what color you are and whoever covers the most wins.