The piano sounds very realistic and the reverb was well done imo. The melodies sound very happy, but the notes are so soft. I don't know much about piano playing, but I thought you hit the keys softer for sad songs. The overall volume of the song is extremely low, that is something you should work on for next time. Even the loudest part of the song could have been louder.
Yes, you are so right indeed. One of the problems is that I'm just not good at mixing, yet. This is no piano sample, but an electronic keyboard, which complicates a few things (Also the reson as to why the piano sounds realistic). The original recording is almost a year old, and it is very low in regards of volume. However, this version is even more silent, because of poor and rushed mixing. I didn't want to boost the volume either, since it began clipping. I also used very sensitive headphones, so with them the volume is actually pretty high (not a real excuse though :p).
There are many ways to compose, play and interpret music. What I mean is you don't necessarily have to hit keys softer for sad songs or harder for happy ones, although stylistically that often gives a hand. Also, this is not necessarily a song that has to portray happiness nor sadness, there are more emotions than that. Oh, and if you play the piano softly in a happy song, it can cause the happy song to have a slightly sadder undertone, and such. The chords and their progressions used are in several cases ones that are more associated with sadness than happiness, but thanks for letting me see things from another perspective; I can kinda see what you mean!
And thanks for this review man, it's much appreciated! :D
Please contact me if you would like to use this in a project. We can discuss the details.