The new, expanded version is still under heavy development. You can track it's progress on Twitter (https://twitter.com/SlipwaysGame) and find out more about the plans at https://slipways.net. So I'm afraid it's not available for download or purchase yet - but I'm working on that! :)
I'm sorry if the page is somehow unclear - but this itch.io page and all the downloads on it are for the original, PICO-8 version of the game.