This is a pretty awesome game. I really enjoyed the style of art used, it has a shel silverstein feel to it which is great. I only wish it were longer :)
You should be able to reset puzzles.
In the sun dial room and torches i couldn't get them work after taking a peak at the walkthrough cause i had already messed em up
Really wish throwing the plane backwards didnt freezer the window.. You should make a cutscene where if the plane goes backwards it crashes and burns :), overall great game.
Pretty fun game. Kind of annoying walking around the planets when the arrow keys change directions.. and like xargonus said the camera is quite annoying.. maybe a "preview" camera so we can see where the other planets are?