Currently in Early Access, Monster Sanctuary might not be finished by so far it's turned out a lot of fun. They're giving more people a chance to now try it, with an updated demo.
This demo update comes shortly after a big update to the full game, which included a whole new area to explore with Horizon Beach. A new story arc based around a treasure hunt, eight new monsters to collect (most of which water themed) along with new items and rare equipment. All sounds pretty great. You can also find the Monster Farm, a place to let all your creatures go out into the open and see them, which does look pretty sweet.
You can see a bunch of it in their recent livestream video below:
As for the newly updated demo it now has 7 languages: English, French, Spanish, German, Russian, Italian and Chinese. Mouse support was added, a choice between a Male and Female character model, new items and equipment, a new monster and so on. It's an expanded introduction to the game, helping you decide if monster catching is for you.