Nice idea, & good song length. Dig the dominant chord at 3:52
The piano sounds a little "clicked in" or robotic, I think it stands to gain via randomizing the midi note velocities and milliseconds that they trigger (e.g. purposefully get the notes slightly off the grid). This will make it sound more played by a human. But, it can be tedious to click in, so. Maybe see if LMMS has a "humanizer" midi effect like Ableton?
The pads throughout the whole song are nice though