very good
this game is nicely put but these are my thoughts:
The visual quality: is awesome - 10/10;
The sound: 8/10 - no sound effects? If you would of added some sound effects in-game when fighting monsters or when a monster dies or when you complete a level then it would have been a damn good thing;
Concept: 9/10 - the game reminds me of Mario but with the gravity change thing it gets better so I love the gravity change concept!
Bugs: I could not orient myself around! Of course on first thought what I say may sound pretty dumb but the blocks are placed at a random order and in the tutorial I did not see anything that said I have to kill all enemies to pass to the next level; When an enemy is near the hero why does it have to jump continuously? It gives out the impression that he is kind of stunned.
In the end, I'd like to say that this game is very good in terms of concept and visual quality!(not that sound or the other things are bad :D )