Toby Fox released Chapter 1 entirely for free. This was an "exclusive" move in the gaming industry to serve as a "survey" for players to test the system and mechanics before the full paid game was developed.
For those unfamiliar with the Deltrune series, the game follows the story of two protagonists, Kris and Susie, who find themselves transported to a mysterious and fantastical world. As they navigate this strange new realm, they must confront a range of challenges and adversaries, all while uncovering the secrets and mysteries of the world. deltarune unblocked chapter 1 exclusive
It looks like you’re trying to find labeled as “unblocked” and “exclusive.” Here’s what you should know: Toby Fox released Chapter 1 entirely for free