I enjoyed the thrill that this game gave me and loved it ever since. To see it expand is quite what it truly deserves.
I paid for this itch.io game a bit more than the Steam price (some folks don't understand that you can do that), and to see this situation...is quite awkward. I don't want to pay again for a few Steam-exclusive features.
I think it's only fair that people who contributed a bit more to the purchase than said price point, to get a least a bit of a reward in return. Doesn't optically help that the situation lacked the foresight that the early itch.io audience gets the update late. Better than never, at least.
Also, all of this makes the Steam version the more feature-complete, as well. What incentive will motivate people to pay for this version anymore, I wonder?