A solid puzzle platformer with a few rough edges.
The idea of changing your weight to solve puzzles is a novel one, and I easily lapped up the first eight levels, but after that it just... stopped. I'd found all eight doors, defeated all of their fiendish brain teasers, but to no avail.
None of the hooded figures seemed to care, I couldn't see a way out and just closed the game. It's a shame really, shouldn't I get a credits roll or something? Very odd.
Finally, consider researching your titles in future. Where I'm from, Dyson is a rather famous brand of vacuum cleaner--
[Tries to Find a Link as Evidence]
"A Dyson sphere is a hypothetical megastructure that completely encompasses a star and captures most or all of its power output". You learn something new every day.