This is a specific case but on 21:9 displays if you enter fullscreen mode there are later parts of the menu visible.
https://docs.unity3d.com/ScriptReference/Screen-width.html
i have no idea of unity but i guess you could position it using this Screen.width variable
Else the game was a bit confusing and tbh i have no idea what i did. it just somehow worked but visually it was very cool. An interactive tutorial - which is out-of-scope for a game jam - could be added after the voting period to make the game easier to understand.
(lol forgot saving my vote; now i've voted xD)