It seems the core of the game is correctly understanding the victory function (time to complete refinement of all resources) and then applying bottleneck theory to correctly optimize each stage.
Definitely a joyous little ten minute romp.
I can't see some of the UI buttons regardless of whether I toggle desktop mode or portrait/landscape.
I think OP just made a small mistake with some of the CSS/JS that handles resizing the game window on mobile viewports. In some cases the buttons are outside of the game, and in some cases the game window isn't using up the full screen real estate.
Some small tweaks for having everything be viewable and I'd say it is playable on mobile.
Nice job