Game itself working is 4 or 5 stars, 1 star is for it simply wasting your money as it is right now.
I immediately bought this classic when I saw it had arrived on GOG. But I've been left disappointed. Sounds do not work, and the game constantly crashes at any moment at random. GOG have not yet really got this fully ready for sale. Have gone for a refund. ROE 1 did not even work at all. :(
It's also an example of how corrupt GOG's review rep system is as well. It's a brand new entry to GOG, so far has one five star review (which looks paid for) an that has 25 pos reps and NO negreps, and one two star review and that suprise suprise has ZERO posreps and 5 neg reps. This will get no posreps either, and probably will have 100 negreps within days.
The whole system is just abusively exploited these days and GOG should remove it like they did in the forums. At least give a posrep if you do agree with that statement.
Anyway, wait until this "matures" here on GOG before buying, as it's brand new, it's crippled by teething troubles and there is no support / discussion forum going yet.
I'm refunding now, and may come back later.