Good art and good use of the voice sound files. However, the last boss of the game was incredibly difficult and took me around 4 or five tries (and a lot of luck) to beat. The use of yellow text for low stats on a light background made it difficult/impossible to read.
Suggestion: Great concept, with really good art, but that last boss was WAY too hard. Tune it back a bit, and give it less ability to heal itself (nor none). Also, find more complementary colors for backgrounds and fonts.