You play as Carol, a young girl exploring the dream world of Crearia to rescue her teddy bear. The world is vibrant, candy-colored, and spans over 20 levels across 10 chapters, including forests, pyramids, and moon bases.

Players on Steam Community have reported frustrating mechanics, such as being unable to grab ledges while a weapon is equipped and audio settings resetting to 100% volume unexpectedly.

“Onirism is what I call a very good 7/10 game... If you have nostalgia for PlayStation 2 games, then it should be right up your alley, but be prepared for some jank and frustration.” GameGrin · 5 months ago Onirism Review: Bubblegum + Kicking Ass - Vulgar Knight

Expert and community reviewers generally agree that the game's ambition is its greatest strength and its greatest weakness.