This is possibly one of the best games ever. See video. Even in single player you will have almost as much fun.
If you like cheesy sci-fi, giant insects, giant robots, and giant lizards, and guns up the wazoo, destroyable buildings, this game might be for you.
Starship Troopers like fun on earth.
https://store.steampowered.com/app/410320/EARTH_DEFENSE_FORCE_41_The_Shadow_of_New_Despair