Games like Mutagen Extinction

"Crea is a role-playing game with single-player, co-op, and PvP options for 2 players. Engage in action-packed combat as you level up, learn over 80 skills, and craft powerful gear. Explore expansive realms, defeat challenging monsters, and uncover the game's rich lore through extensive research and discovery."

"Lantern Forge" is a sandbox survival game with isometric hack 'n slash combat, set in a procedurally generated world with day/night cycles and dynamic lighting. Gather resources to build, craft, and explore different biomes filled with unique monsters and treasures. Choose from 4 skill trees, enchant equipment, and build a town center for trade. Descend 90 levels underground to find rare materials and power up.

Serin Fate is a pixel-art adventure RPG, with gardening, creature tending, unlockable difficulty modes and classic storytelling! Discover your Magic powers, collect Chimera (regional creatures), and travel the world as a Witch. Inspired by Harvest Moon, Legend of the Seven Stars and Pokemon.

Len's Island is a relaxing, action-adventure game with survival and sandbox elements. You'll build and customize your home, farm, and explore procedurally generated islands. Fight monsters, discover secrets, and find inner peace in this immersive, nature-filled experience.

Outward is a fantasy open-world RPG that can be played solo or with friends in online or split-screen co-op. As an adventurer, you must manage basic needs like eating, drinking, and sleeping, while navigating a realistic and immersive world filled with magic, exotic creatures, and meaningful consequences. Despite some grinding, optimization issues, and bugs, Outward offers a wholesome story, atmospheric music, and humor, making it highly replayable.

"Nightingale" is a PVE open-world survival crafting Role Playing Game that can be played offline or with up to 2 players in co-op mode. The game features excellent gameplay, awesome visuals, and a wholesome story set in a variety of mystical and dangerous realms, where players must build, craft, fight, and explore to become skilled Realmwalkers and find their way to the magical city of Nightingale. Despite some bugs and grinding, the game is very atmospheric and offers ingenious replayability.

Towers of Aghasba, an open-world experience where players can build vast settlements and grow sprawling ecosystems on their fantasy island.

"Eden Rising: Free Explorer Edition" is a free-to-play game that offers 12+ hours of base gameplay, including exploration of various landscapes and participation in challenging sieges. Players can craft defenses, play solo or with up to 8 players, and keep their character and progress as they move between servers. This version also allows players to access expansion content for free when joining an Ascendant Edition server. Perfect for players looking to experience the game in solo or multiplayer mode, or for those with friends who have the Ascendant Edition.

"The Survivalists" is a role-playing game that offers both single-player and multiplayer options, with up to four players able to team up for co-op gameplay. The game takes place on a procedurally generated island, where players must gather resources, build shelter, and defend themselves against enemies. Monkeys can be tamed and trained to assist with tasks, and the game features day/night cycles and a variety of biomes to explore. However, it's worth noting that the game can be grindy and is known to have bugs.

"Force of Nature" is a physics-based puzzle game where players harness the power of natural elements to solve challenging levels. Utilize wind, water, and gravity to move, manipulate, and transform objects in order to reach the exit in each stage. With over 80 levels and a level editor, there's a wealth of content to explore in this creative and engaging title.