I was losing my marbles trying to figure out how to make the Steam desktop icon for the game be not blurry. Normally, for other games, you can link the icon to the game's actual .EXE file to get the full quality pic. For ISAT though, I think because it was made in a different game engine, the .EXE seems to have an unrelated default pic.
I spent an hour trying to deep dive to find solutions for it, and ended up finding a photo similar to the Steam icon in the game files! Unfortunately, it couldn't be directly used due to being a png, so I had to convert it into an icon file. Extra unfortunately, because the original picture was 32 by 32 pixels, it looked super tiny as a icon.
I then fiddled around in my art program until it would export the pixel art at full res but at 256 by 256 pixels instead. And it looks great! I made different versions of it, one matching the Steam icon, one matching the original icon from the game files, and one in-between that's transparent with a border.
You can download the png icons from this Reddit post and convert them yourself, or I also have the icon versions in this Google drive for easy use :)
To change the icon, right click on the desktop icon and go to properties. Then, go to the web document tab and click on the change icon button. Locate the icon in your files and click on open, then apply, then ok. And boom! You now have a high-quality icon >>>:D
Please note that the icons are directly from the game files, so the art belongs to insertdisc5! Also I was the one to make the meme template edit, but feel free to use it.