I have always enjoyed games that explored the whole Chernobyl aftermath and some of the mysteries behind this disaster. This survival sci-fi horror looks pretty good so far in early access on Steam: https://store.steampowered.com/app/1016800/Chernobylite/

Chernobylite is a science-fiction survival horror experience. The game is mixing free exploration of its disturbing world with challenging combat, unique crafting and non-linear storytelling. We will constantly challenge you to:

SURVIVE
Craft your gear and weapons to protect yourself from the supernatural threats lurking in the zone. Decide what happens in the world around you.

PLAY BY YOUR OWN RULES
Ally or compete with other stalkers of the Chernobyl zone to survive. Each day brings new challenges. Plan your strategy carefully if you want to survive.

EXPERIENCE
Maintain your resolve and keep your wits about you – the Chernobyl Nuclear Power Plant is not what it once was. No one can foresee the horrors that may have befallen your beloved.

Chernobylite
main features

• Explore the beautiful and horrifyingly accurate 3D-scanned recreation of the Chernobyl Exclusion Zone;
• Collaborate or compete with other stalkers you meet in the Zone. But whatever you do never fully trust them. Remember everybody has a hidden agenda. Always;
• Face and survive the natural and supernatural threats;
• Immerse yourself in the non-linear, thrilling, science-fiction horror story;
• Make a good use of your character's knowledge, to craft your equipment and manage your supplies;
• Fight against the savage creatures pouring from the alternate reality;
• Investigate and collect data with sophisticated environment and substance analyzing tools.