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Admin(+1)

Is the issue that it doesn't install? Games in draft are not yet supported by the itch app, see https://github.com/itchio/itch/issues/1080 - the problem will go away as soon as you publish the game.

(+1)

Actually, I didn't bothered hitting the install button. Since it's a WebGL game, I thought that it would run on the app in the same fashion as the browser by displaying a rectangle with the game. =P

Now that the game is installed, it's working normally.