Voile/TestGame/TestPlayer.cs

using DaggerFramework;
using DaggerFramework.SceneGraph;
using DaggerFramework.Utils;

public class TestPlayer : RectangleShape2d
{
    protected override void OnStart()
    {
        base.OnStart();
        Color = Color.Cyan;

        _camera = new Camera2d()
        {
            Current = true,
        };

        Layer.AddEntity(_camera);
    }

    protected override void OnUpdate(double dt)
    {
        base.OnUpdate(dt);

        var sprinting = Input.IsActionDown("sprint");
        _speed = sprinting ? 400f : 200f;

        var velocity = Input.GetInputDirection("left", "right", "up", "down") * _speed;
        Position += velocity * (float)dt;

        _camera.Position = MathUtils.LerpVector2(_camera.Position, Position, dt * 5f);
    }

    private Logger _logger = new(nameof(TestPlayer));
    private float _speed = 200f;
    private Camera2d _camera;
}