an incremental where nothing is the same q to see upgrades the number to the right of the hyphen is the cost of the upgrade clicking the button in the bottom right corner with the big L on it lets you choose whether you want to unlock the next layer or not (i suggest you hide the upgrades list before you click it) if you have more than one layer, a grey button to the left of the layer unlocking button will appear, clicking this one lets you jump to a layer of choice (again, i suggest you hide the upgrades list before you click it) the button in the top right corner is the reset layer button, it doesn't reset all progress, clicking it gives you an option (yet again, i suggest you hide the upgrades list before you click it)
credits to: the composers of EToH for Skyward Archipelago @RokCoder for helping with a major bug that made the game unplayable
