Megaquarium is a pretty sweet game, especially for those of you who love aquatic life. Megaquarium just got a lovely update too, adding in some proper modding support.
It now supports the Steam Workshop, although it's not locked to it as GOG owners can use mods too it just needs you to download and add them in manually. Not that it has a Linux version on GOG though…it's still missing. Anyway, the Steam Workshop already has quite a few new bits you can add into your game, including the Nurse Shark made by the developer along with tutorial videos to see how the model and mod were made.
Since release, Megaquarium has had some rather great updates. I was especially a fan of the ability to customize how you play it, so you could make it a proper sandbox experience if you wanted.
Even if you play it normally without adjusting anything, it's a very relaxing and chilled-out experience. Worth picking up? You bet!