Overall, it's a fun game.
First and foremost, I like this game because it forces the player to make decisions as to which path to take; almost every sector has more than one possible route towards completion. Taking a more difficult route or doubling back once you gain a higher ground to get crystals is the very definition of "high risk, high reward" and the fact that these more difficult pathways are optional allows multiple playing styles to enjoy the game.
However, as stated before the game lags when loading some objects. For me personally, it lagged for almost everything that came into the screen, and thus it became much more difficult to play through the game - at times it takes much longer to complete a jump than others, and still worse it often stops lagging in the middle of a jump and I tend to overshoot.
Perhaps having a quality control or option to remove the background could help, however this is only speculation because I don't know too much about that sort of things.
However, once again I would like to stress the fact that I greatly enjoyed this game, and appreciate the challenge.