If you are looking to try the core game without purchasing it first, there are two primary official options:
While the base game is a narrative-driven experience with a distinct beginning and end, this free expansion focuses purely on the deck-building mechanics. Inscryption Free
A free demo is available on Steam that covers a portion of the initial cabin gameplay. If you are looking to try the core
It isolates the "Cabin" section (Act 1), which many critics consider the game's strongest part. Inscryption Free
Beating higher Challenge Levels unlocks new cards, items, and "Dev Logs" that expand on the lore of the character Kaycee Hobbes. Ways to Play for Free