The search for often comes from a place of financial restriction, which is understandable. However, the game goes on sale for as little as $5 (for Rebirth) during Steam sales. Here is why buying is better than browsing:

: On PlayStation 4 and 5, you can use the Share Play feature to simulate local co-op with friends over the internet. Steam Remote Play Together

It is the only legitimate way to play the full modern Isaac with all DLC (Repentance included) inside a web browser tab.

Disclaimer: This article is for educational purposes. Always support developers by purchasing official copies of The Binding of Isaac on Steam or console stores.