The Oasis is, as its name says, a dive resort, so diving is the front and center theme here.
Guests are almost exclusively adults and german speaking (D/A/CH), and basically everyone shares the passion for diving, which results in a very friendly, almost intimate atmosphere.
This is also helped by the layout and size of the resort: it resembles a small village where basically every room is its own little tastefully decorated house (maybe 40 or 50 or so in total); it all feels very atmospheric and pretty authentic to the region. If there's one small criticism, it's that it's starting to show its age and may need renovation here or there; and, in 2024, not having Wifi in the rooms is seriously outdated.
There's no organized "animation" or parties whatsoever, on purpose, but of course you're free to chat and have drinks at the restaurant, pool, or bedouin tent bar, which are all very nice.
Breakfast is ok, dinner is more varied and a good, tasty mix of egyptian and some western food; drink/snack prices are reasonable.
Diving/snorkeling is very well organized (very professional yet friendly staff!), but with a somewhat confusing price structure, and may end up more expensive than you would expect (but yeah, it's not a cheap hobby anyway...)
Overall, the Oasis is -- fortunately -- very different (light years away!) from the mass tourism of these huge hotel bunkers you also find in the region, and highly recommended.