Dev singular, I'm afraid - it's just me. But thank you! I'm glad you're enjoying the game, and I hope you stick around and enjoy everything I have planned for the future, too!
As for your question, your decision to take or destroy the relic will have a BIG impact on the ending of the game, but that impact won't be revealed until much later on. Don't worry, though, if you made the "wrong" choice you will have one chance to fix it (after that you'll just have to live with the consequences) :)