I think it would be nice if we could upload and edit our games on the dashboard via itch app. Is it possible?

Now the app is more or less a fully-featured browser, so you can definitely access your dashboard / edit games from there :)

Here's a tip: when opening one of your games in a tab, just hit 'Ctrl+L' (or click the address bar up top) and add '/edit' after the game's url — it'll take you to the edit page.

A 'Developer mode' for the app is planned for later (but is currently blocked by this issue)