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.

After playing 1-2 hours and maxing most of the skill tree, I'd say the core gameplay loop is addicting and fun but it's disheartening each successive tier doesn't really change besides just getting harder. There's two locked/not developed tabs which I'm hoping spice things up.

I also think the last fight after collecting all the resources where you destroy the crystal should be fast forwarded since it's such a waste of time.

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