Hey bro, I have little bad and better news:
Bad: I have no fucking idea, why it can`t work on Chromebook;
And its hard to make this game downloadable, because freeware part of Construct3 doesn`t allow it;
But BETTER:
I start migrating project into Unity3D. I started yesterday and I see this game will not only playable on Itch.io, but there will be more development ways :)