Really love the concept of the game, however needs some major polishing.
Save/loading buttons aren't working (Chrome 64-bit) so that's one to flag as high priority. Also it's not very clear how to obtain more range on the explorer, maybe add this to the tutorial or one day open a wikia with this kind of information?
Considering the early state I'd say great job none-the-less I can't wait to see where this is going :)