Peaceful
Well this is a peaceful sounding piece I think. Would make for awesome credit music or music that plays after the final boss battle in a game is over. The smoke clears and you and your friends are just barely standing as you watch the boss fade away from existence no longer able to cause people problems in your time and age that you live.
The piano is a great start here and gives a feeling that peace has returned and that everything will be ok in time as people begin to rebuild society under a new rule of freedom as well. People smile looking towards the sky noticing the final boss that ruled the planet for so long is no longer.
The synth has a weird piano like feel to it I think which is always cool. The bass feels good as you hear it going up and down and providing a peaceful sound with it. The drums are also great on the ears and I like them too.
Overall, wonderful piece of work, sounds lovely.