This is a fun adventure, clearly crafted with original thought and care. The potential for combinatorial explosion is pretty evident in the design-- here the author has simply not gone for completeness as a solution-- but for me this felt forgivable. Besides, if the story of a picked-on kid standing up to three bullies with nothing but his imagination and love of invention doesn't capture your attention, you might only be half a human being. Plus, it's got its own soundtrack.
Full disclosure: I did some beta-testing for the ADRIFT release of this game.