I liked it, but I think control wise using 'down' to activate the pickaxe would feel more natural than pressing space twice, and I was afraid of dropping off the first 'island' because I thought it was a bottomless pit.
Thanks for playing, I perhaps should have made it rebindable, as when testing pressing and holding space felt more natural for me than a few other things I tried but I understand personal preference. Also I should probably have put somewhere that you need to go down! :)