if your storage system can be defeated by 1cm, you need to reevaluate.
It's actually fine (not pretty, but works) if it's only longer in 1 dimension. Only being wider as well makes it a problem. And normally, the standard is common enough that you absolutely can build a system on that; out of 80+ games, this is literally the second game that doesn't fit, and at least the other one needed to be bigger (Katakomben).
But storage isn't even the problem, what I'm really annoyed by is transport. Cajon bags (which I use) aren't uncommon for games precisely because they fit that standard of a 30x30cm base.
The game is already opened and I'll try it, but it will have to reach a much higher quality than it would otherwise for me to keep it just because taking it to game night now means bringing two bags instead of one.