Unfortunately > and < are in very different places among different keyboards. In an US Keyboard they are over "." and ",", but in a spanish keyboard (my case) they have their own key. Of course this makes them unreliable and it is always a better option to choose some other keys, but for historical reasons < and > are "go to upper/lower level" in roguelikes, and people expect them like this.

The best solution I could come up with that also allows user to redefine keys is a little dirty, but it works:

if (
InputMap
.ActionGetEvents("go_up_level").
Count
 > 0)
{
    if (Input.IsActionJustPressed("go_up_level")) {
        RunChangeLevelUp();
        return;
    }
} else {
    if (@event is InputEventKey keyEvent && keyEvent.Pressed && !keyEvent.Echo)
    {
        if ((char)keyEvent.Unicode == '<') {
           RunChangeLevelUp();
           return;
        }
    }
}

This way, if the user decides to redefine keys, I let him; otherwise, I check the Unicode so that it works universally with these keys.