Allright, here's my review (SPOILERS)
The game is very good, but there are some points where you could improve.
ART-STYLE: It's nice and pretty, but does it really need to be the same for every level? It gets bland after a while. Put something that differs a level from another.
COMBAT: Great. But not too great. When the enemies hit you, you have no way to attack. You must wait for it's combo to finish and get all the damage. Same for the enemies, they can't attack while you are hitting them, making it too easy by button-smashing. The W attack is just overpowered.
LAST LEVEL: In the last level, you play as the bad guy, because he is the one who must win. But i must say, he's got really shitty powers. His powers are ALL against him. The S power will make you fall down, the D power is useless, the W power is a bit more useful but still not as useful as the standard A. I understand you wanted to give him some different powers, but these were just too awful for that environment (floating island).
ENEMIES: They are bland. Just the same guys over and over. There was only 1 "mini-boss" (which i overkilled imediately by hurting him with the W, recharging it with the D attack and then doing the W again). The fire-breathing-bats were annoying at first, but then they became a "Special Attack Farm". If you know what i mean...
LEVELS: Despite the fact that the game was so short, some of the levels weren't even levels. Some of them were just the spawn, a hole, some stairs, and the end of the level. So, the levels are around 10-11.
TUTORIALS: Some of them were very VERY useless. In some parts it showed me how to doublejump when i already did it to pass the previous 3 levels.
ORBS OF SPECIAL ATTACKS: Why? Why must those things exist? Just so you can "W" your way out of there by teleport-attacking the flames? It would have been much better and more challenging if it was an unlimited spawn of enemies, and then when you finally got the full special bar, you would be able to get out.
Those orbs take away a big part of the game.
OVERALL RATING: 7/10 3/5.
Average game with some issues. Nothing original or new, sadly.
I liked to be the bad guy at the end.