If you're an employee, you actually own nothing. To own it, you need to put some skin in the game, feel the burn when things fail and share in the bounty when it succeeds. A "feeling" of responsibility, is one thing. But having your bottom line decrease when you mess up "feels" quite different.
You moved your own goal post. :P True ownership doesn’t require “skin in the game” or feeling any burn, or really any work at all. Buy stock, get money. Why beat around the bush with working hard and feelings?
As for a sense of ownership, not a problem when you're the only dev.
I own everything that isn't the windows server and desktops.
All the Linux servers, the network, the android terminals the production software, driver terminals etc are all my responsibility.