Seems fun so far (played <30 minutes), but the auto-attacking paired with inability to precisely select what tile you want to spend your stamina on sucks, end up fighting the selection reticle. Especially when you need to move the mouse to pickup something (but there's a upgrade for that later), or when you press on the UI button element to start a run and because there's a resource behind the button it auto wastes stamina. Also when you do a run in a tier where you have already collected Umbra, the last resource that gets dropped never is collected.

Edit: Discovered you can turn off autoclick in the settings. Yahoo.