I like your treatment of the melody, but there's too much reverb. It sounds like pads are stuck on, or something... it's too ethereal and yawny. Perhaps a variation in the instrument type may help-- bells, pads, and synths are all I hear-- or just dropping a great bit of reverb from the final master. It sounds like it's on the percussion; how about putting it on only the pads?
Without getting into things like keys and the such, this is a good start. Consider more work with the perc, touch up those areas, and you might really have something.
Flandre Scarlet, you're the best!
You're so cute and evil, and you have an amazing theme song that thousands of people remixed!
This song is great! The 10/10 is there because I love Touhou and Flandre Scarlet!