Valheim, developed by Iron Gate Studio and published by Coffee Stain Studios, utilizes the Unity game engine.
Unity is a cross-platform game engine developed by Unity Technologies. It's one of the most popular game development tools due to its flexibility and user-friendly features. Unity supports both 2D and 3D game development and includes a ton of valuable features for game developers, such as an intuitive visual editor, physics system, animation tools, support for multiple platforms, and more.
Unity uses C# as its primary programming language, which is widely used and easy to learn, making it suitable even for beginners in game development.
Here's a small example of how you might create a simple player character movement script in Unity using C#:
This code would be attached to the player object and would allow basic up/down/left/right movement at a specified speed.