Hmm... I don't think enough people would pay for the game to make back the money I would have to pay to publish there. XD
The web saving is handled by Godot. I'm just saving a text file to the local storage and Godot internally maps it to the browser's internal database or, if running the desktop build, to a folder in the local PC.
There could be some conditions that cause some achievements not to trigger, such as the Crowki vision one. There was not enough time to thorougly test all possible situations so it is expected some small bugs made it to the published build.
I'm glad you enjoyed the game! :)