I know this is all minimalist and stuff but I just pressed that star icon thinking it had something to do with achievements maybe, then a bar showed up with a cross and a checkmark. Clicked the checkmark thinking that would be okay and return me to the menu but, POOF.
That apparently reset all your progress... How to F was i supposed to know that.... Might play this game later again, but for now my enjoyment has been destroyed because I lost progress. :(