Hiya, I'm guessing all the lag and visual jankiness is as a result of this being a web version and now deprecated since you seem to be releasing a Steam client? Anyway, Firefox, latest version as of this date, Win10 machine. Actually unplayable as a windowed game, where the cursor doesn't correspond with its position on the screen and later with vertical/horizontal judder both in the upgrade menu and while trying to navigate the ore map.
I leave this here just in case it's of any interest. Good luck with your game! :)