I love short experimental games and Swallow the Sea is up there in my favourites this year, as it's so delightfully weird that it's absolutely captivating.
Swallow the Sea has you control a "lowly egg cell journeying through a swollen sea of strange and humanoid fish. Prey on smaller life, growing larger and stronger to perhaps someday be born". It's incredibly atmospheric, which is helped by the great audio work done on it too.
You go through each section, trying to eat up enough to evolve a little and grow so that you can smash through a particular wall to proceed onto the next section. Each of these has new horrors that await you.
Freaky and I tell you what, it gave me a bit of a jump-scare. There I was, minding my own business sucking up smaller life forms, when out of nowhere this colossal and horrific sea serpent like thing decided I was for lunch. I kid you not, my heart skipped a beat. It's like a much simpler (and way more stylish) version of Sipho in a way.
With headphones in and sound up, it's a thoroughly worthwhile experience. Check out Swallow the Sea free on game store itch.io.