10/10 Solid because it features very cool enemies and how to take them down and features a CO-OP mode to have some really cool time for casual Games.
8/10 not the best but wat the heck, you dont need beautiful graphics to play any type of game, its the gameplay that matters.
9/10 Has sounds that resemble Laser Beams and shotguns that sound really good.
7/10 Worth it because if your just casual gamers then this might work out for you because it features strategic gameplay which feels really good.
Overall I would give this game an 8.6 because it really is fun and really cool to play through the game