I am not a Monster, a title developed by Cheerdealers under the publisher Alawar Premium, officially announced they are adding on a single player campaign called First Contact, slated to launch 2H 2019. The new single-player campaign edition added on will feature 8 playable characters (you will play all 8 during the game on different levels), 40 unique levels, and approximately 10 hours of gameplay.

A tourist spaceship Albatross is invaded by huge lizards of unknown origin. Another day to be saved by brave Captain Laser and his big Laser Gun.
Play as 8 characters over 30+ levels, learn the story of Captain Laser, uncover why the monsters are here and find out what the passengers are hiding!
Each session features a group of up to six players, where every player is randomly assigned the role of civilian or monster, with a max. of two monsters.

Elaborate a team strategy, but don’t trust your teammates.
Suspect everyone and question players’ every move as you narrow down the list of possible shapeshifters.
Save as many passengers and kill as many monsters as you can.
But watch out: once infected by a monster, you have just a few moves to heal, otherwise, you’ll become a monster yourself.
Make the most of the loot from boxes around the starship: a combination of two weapons will give you a unique ultimate ability that you can use to turn the tide of battle.

Pre-registration for the closed beta opens officially today forward, with invites going out this July. All interested players can sign up here: https://iamnotamonster.com/

Cheerdealers gives a hint to the coming single player campaign below:

“Captain Laser, a famous hero of space battles, is once again invaded by vicious monsters… he fights them off, protecting all the passengers and starship crew. There’s something different about this battle, though; it just doesn’t feel the same to him; there is more than meets the eye… As the narrative continues, he will soon learn the true nature of these monsters, thus revealing hidden secrets about the other passengers.” – Stanislav Stepchenko, Producer, Cheerdealers