DemonStar is great fun. WHen I was a kid I loved Tyrian and hence, strating to play DemonStar at the age of 19 was a trip down memory lane. DemonStar is more speedy and a bit harder (You die much easier, after only a few hits). However there is less weapons and the enemy and countryside is not as fun doesn't differ as much. All in all it i great fun, aspecially if you are two!