Not sure if original creator will be amused, so it may not be there for long, but.....

Binding of Isaac clone.

https://amos.me/games/paper-isaac/

I`m guessing this is old, but it`s news to me.

Also, the FAQ said the creator was fine with it, but the link to that isn`t up.
Someone on Reddit has asked & will say if/when they hear back.

https://www.reddit.com/r/linux_gaming/comments/4jvo9a/paper_isaac_an_open_source_clone_of_the_binding/