Really liked the game, though honestly not the most strong use of the theme. I agree there were some easier routes, but to those who like a challenge will definitely take the hard path(its much more fun).
The final level with the gravity change was a bit confusing at first, but i evently got the hang of it, wish that were also in the rest of the game, would 've made it much more interesting and would be a pretty good use of the theme. Or at least that's my opinion.
Overall, nice game, fun, simple, challenging (if the player chooses so), and a lot of potential for speedrunning....