This was good fun, I loved the voicelines and the narrative. The devil was a very well made character and learning more about the narrative and trying to avoid signing the contract was a fun challenge.
Maybe you could have made more well defined endpoints for the game, like it ends when you sign the contract, or there is a certain sequence of dialogue choices that you can make to avoid signing the contract all together (perhaps there already is and I just couldn't find it).
Overall I loved the weird vibe and atmosphere of this game, the voicelines were very well done (5/5) audio. Congrats.