if (x <= (camerax() - 200))
    cleanup = true;
if (crash)
{
    cleanup_timer--;
    if (cleanup_timer <= 0)
    {
        crash = false;
        cleanup = true;
    }
}
if (cleanup)
{
    cleanup = false;
    if (explosion != -1)
        instance_destroy(explosion);
    instance_destroy();
}