It is not possible to use the ALT key and scroll wheel in games on gd.games, if it is not in full screen. Because these are browser shortcuts and trigger things like opening the menu bar or jumping down the website.
The same thing existed for the arrows and space key and was fixed some time ago.
My request would be to do the same for ALT and scroll, when the game is active, maybe also for the Windows-key.
(Space and ALT is not relevant for Chrome, but for Firefox, Opera, Vivaldi, Edge,…)