Might want to focus on actually creating the game before releasing it. Allow me to explain:
For one thing, the music obviously doesn't loop properly. You already know this, but I'm using it as a valid point because you shouldn't have released the game if something as noticeable and annoying as this existed in your game. On the bright side, the music sounds really nice, and it would fit very well if you got it working.
The tutorial is absolutely ridiculous. When you walk into a class, the teacher doesn't teach everything they will be teaching that year in the span of an hour. You're introducing your player to a ridiculous amount of important material very quickly. The player does not have the capability of memorizing all that stuff, much less have the patience to read a whole bunch of text on the screen. I guarantee you that most players either left the game before they had the chance to finish the tutorial. Even I skipped most of the tutorial.
I played the game for about ten seconds before the game just froze. I don't know what happened, but I went to go fight an enemy and the second I hit "Z" the game froze. You cannot possibly release a game this buggy and expect people to play it and love it.
Also, while the graphics are really nice, they don't work well. For example, the acid puddle doesn't work right. It works more like a wall. Go back through the tutorial and check for yourself. In the end, it just makes for some dissatisfying graphics.
While you're bringing me a pretty broken game, it's a game that can easily be repaired. With some work, you could have a great game in the works here. Keep working on this game, however, don't try to do anything else with it until you can bring us a major update that fixes most of the major flaws and allows for an actual playable game. If it's possible, keep me updated on this. I cannot wait to see the direction this game goes.