public class Game : MonoBehaviour
{
    public float EnemySpeed = 1.0f;
    public float HeroSpeed = 1.0f;
    public int ParticleSmokeCount = 15;
    public int NextEnemyCount = 12f;
    public float MaxHeroHealth  100f;
    public float HeroHealth = 100f;
    public Enemy[] Enemies;
    ...
}