Great game. I started this being very skeptical, since it was an RPGM game and I try to avoid those. However the concept seemed interesting and different, so I gave it a shot.
And I'm glad I did. There is lots to do here, the survival aspect is what you'd expect, a bar to monitor each need and gets reduced over time or by doing actions and is filled by % values depending on the food/drink quality you use to fill it, you have a need to sleep and urinate etc. This works pretty well and does create some urgency, make you need to plan things out a bit and not go too far away from campsites for too long, it does its job. However the game shines much brigher in the features introduced by this concept, giving you the ability to add stuff to your camp like traps, tents and auto-miners. The world itself is quite big, so you'd be setting up in multiple campsites, eventually setting for a main one.
Onto the character development side, there are a ton of things you can craft, including armor and clothing in varied colours (including some endgame more joke-ish and super lewd ones.. with tentacles and.. errh.. heads..) that you can visably see being worn on your character during the main menu, conversation and combat. This applies to weapons too, each are visable to you.
Combat is standard RPGM combat, nothing too special, though I do like how you get a full body of your character and how once the durability of your armor or weapon breaks, you see that happen on screen through the character picture. There are also some moves you can get from the skill tree menu in a campsite, though they are also basic, just some durability boosts for your tools and some basic moves for combat like a heal, stronger attack and a stun etc.
As for the gameplay/story itself, the story is actually surprisingly interesting when you get to the first town and pick up the quest there, during this quest you meet a strange character at an overrun library, there you learn about what's on the island, and get introduced to a kind of conspiracy. It was a surprising but pleasant twist, and that's just the start of it.
Other than this, you can spend time gathering resources, this is a bit grindy but not too much - It's just enough to let you feel rewarded for your progression. As a plus, if you want to be lazy there are a few good areas that basically allow you to farm all the money you want to buy the common stuff, instead of continually gathering them manually. And monsters respawn once you leave the area and come back, so farming for monster drops is easy enough too. The game can fit both types of people, even if that wasn't its intention.
Sex scenes are well made. Have some good dialogue, if not a bit heavy with the moaning lines, though that's just a minor gripe. There is also a gallery to revisit previously seen scenes, so that's convenient. The scenes include quite a few things like prostitution, sleep molestation, femdom, solo, tentacle and monster rape/gangrape, including the possibility for entrapment and being locked up as a sex slave, causing you to need to find an escape.. or just, you know, stay there and enjoy the free food and penises.
- Rape is entirely optional if you don't take any risks in the game then you could play this without ever personally taking any dick, but other NPC's around you might not be as (un)lucky.
TLDR: It's a very good game for an RPGM one, lots of content and fun progression+a good story. Try it.
Game length can differ, typically, just for the story conclusion, you'd be looking at 10+ hours, possibly much more due to the survival nature of it.
If you want to become god and get the best weapon/armor in the game and try and get all scenes etc then you could easily add a few more hours on top.