Hi! Interesting question.
These are two different games. A Kingdom for Keflings (this game) is on itch.io. A World of Keflings (the sequel) is coming soon on Steam. (We plan to release A World of Keflings on itch.io at some point as well, if you prefer buying here.)
We did drop the price of Kingdom here to better reflect its status as an older smaller game. The second game (released 2 years after the first) is much more. If you're unhappy with your purchase here, we can try to get you a refund through itch.io. If you feel this game should be delisted or you're still unhappy, let me know! Players keep telling me they like Kingdom for nostalgia reasons and don't want it to go away. We don't currently plan on releasing Kingdom elsewhere, just here on itch.io.