Does Tesla Effect have cloud saves yet? If not where can I be a squeaky wheel to make that happen?

GOG is terrible at bringing cloud save support to their games. If you filter the games in the store by that feature, you'll see it's a very small number that supports it. Nothing we can do but vote on the wishlist item(https://www.gog.com/wishlist/site/more_cloud_support_for_games), and wait.