The polish of this game is incredible. Sound design and animations are very well made and make the game feels great. The art is very cute. IMO the only polish-related thing that is not perfect is the music that doesn't really fits the exploration theme.
The gameplay is simple yet addictive. At some point it become a bit too click intensive for me, then I found the "x2 resources when exploring" bonus and I got basically infinite resources and explored everything.