I've completed 19/20 of the levels, that being all of the main island and all of the second island, but I haven't completed the game. When I go to the bottom of the frozen make when I try to jump to that little island with two levels it instead puts me to the point where I can head to the right onto the bridge to the boat.
On the second island all the levels are beaten but there appears to be a single small island to the top right with one mushroom house I can't seem to get to.
What am I doing wrong? There is nothing about this on the site and it lists a 0.1 as the latest Mac version, which obviously isn't.