relics/RelicBandage.cs
using Sandbox;
using System.Reflection.PortableExecutable;
using System.Runtime.Versioning;
using System.Threading.Tasks;

public class RelicBandage : Relic
{
	public override void LevelUp()
	{
		base.LevelUp();

		int healAmount = 3;

		Manager.Instance.HP = Math.Min( Manager.Instance.HP + healAmount, Manager.Instance.MaxHP );

		Manager.Instance.TimeSinceHPChanged = 0f;

		var mouse = Mouse.Position;
		var camera = Scene.Camera;
		var ray = camera.ScreenPixelToRay( mouse );

		var tr = Scene.Trace.Ray( ray, 10000f ).Run();

		Manager.Instance.SpawnHealHPFloater( healAmount, tr.EndPosition );

		// todo: better sfx
		Manager.Instance.PlaySfx( "bandage", tr.EndPosition.WithZ( camera.WorldPosition.z - 100f ), volume: 0.7f, pitch: Game.Random.Float( 0.95f, 1.05f ) );

		//Manager.Instance.RemoveRelic( this );
	}
}