a few constructive criticisms
1) it is possible to lock out the 3d ship Tetris puzzle, try adding a reset button that disables when you solve the puzzle.
2) did you mean for it to be possible for the gate block on the way to that puzzle to be pushed into the hill?
3) the mouse control is clunky and doesn't like to turn around all the way, would recommend that the a/d keys rotate camera (and you) instead of fixed move left/right.
4) is there meant to be an ending cutscene? I would recommend adding one, there was no cutscene triggered when I finished the game.(either that or I found a bug activating the pirate ship at the end)