Is there a reason that the Steam version is $9.99 CAD and the Itch.io version is free ? Is the Steam one more up to date ?
The steam version has a few extras that will be in the update and some small steam specific changes, it's not much, so if you've played the free version it's not really worth buying the steam version unless you want to support me.
The main reason for the steam version is to gain a bit more support, but they don't like links to patreon/etc. on their platform, so it's more or less a workaround.