https://store.steampowered.com/app/826600/I_am_not_a_Monster_First_Contact/

The informed minority Vs. the uninformed majority: а turn-based tactical multiplayer in a retro sci-fi setting with randomly assigned roles and Mafia/Werewolf party game features.
Check the full description for more details!

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.

Features
If you are a human
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.

If you are a monster
Make use of your disguised appearance.
Participate in the conversation to learn your enemies’ strategy and adapt to it.
Take advantage of your species: you can see everything that your fellow monster sees.
Infect the passengers to respawn if you are disclosed and killed.
Infect the civilians to turn them into ones of your own.

Each turn for civilians and monsters has two time-limited stages:
Planning Stage: players choose their actions;
Action Stage: all planned actions are executed at the same time.

Activating the steam key

1) You must download and install Steam http://steampowered.com/download/SteamInstall.msi (if not already installed).
2) Create a new account on Steam or go to an existing one.
3) Select "Activate via Steam ..." in the "My Games" section, and enter the key received after payment.
4) After activation, the game will appear in your list of games and you can install it.

Please leave feedback after successful activation of the game.