Hello! :)
Thank you very much for the message!

We've tried really hard to keep the two versions as similar as possible.

Changes include:

-A brand-new message system 

-Another Story bonus episode is playable right after the main game instead of being a separate download

-The Bonus folder is unlockable from inside the game

-Most maps have been reworked for better flow/less collisions

-Some items are now interactable objects and will have comments

-All languages are playable from the same version, no more multiple downloads, and they can be switched any time from inside the game

-Added better support in terms of FPS, message speed, help files, commands, full screen support, keyboard configuration

-Some languages have been almost completely reworked so for people who played them, it will be quite different. (the itchio version will also be changed, though)

This is all we can think of off the top of our head. We've been working on it for 4 months almost, by now.

There are a few more minor fixes etc. to make the game more enjoyable, but we don't want the free version to become only half of the experience or anything like that. :)

Part of why the Steam version will be paid is also to be able to bring more games to Steam as well and to pay translators, since uploading a game there isn't free, but we didn't want to offer the same exact version as the itchio one for a price.

Hope this answered your question! If there's any problem, let us know.