SO here's some constructive criticism. 

 1) The camera. You say that the game is pixel perfect, but all that meant is that moving diagonally looked really jittery. So.... why make it pixel perfect in the first place if the only effect on gameplay is a negative. A smooth camera is way more important and also simple to implement.

2) The art. Visual inconsistency is a very common trap to fall into when using a outsourced tile set and I do think it takes away from the game. The houses walls work alright with the outside and flooring, but the character looks insanely out of place. When the game takes place looking at the player all the time, it's important to make the player look... good. It currently doesn't, and I think it'd be better to spend time making a good looking player over a good looking bird for instance. The bird has animations while the player doesn't.... why don't we play as a bird at that point?

3) The gameplay. Welp it's just "walking" around, which could be fine if there was more to interact with, or if walking didn't hurt my eyes from the jittering. I did like the bird and stuff, but it's severely lacking in content or polish. Overall it feels like there was just a lack of effort to make a FUN or at least relaxing game. More thought needs to be put into making the gameplay loop more polished, then expanding on the environment. The lack of effort is most obvious on the thumbnail, where you just freehand wrote "Tranquility" over a screenshot of the game in some sort of image editor.

4) The sound. The music that you made was... not great but a good attempt was made and I respect that. However, you completely forgot to loop the music. I chose the second track for my playthrough, and was met with silence after getting out of the house. No environmental noise also hugely took away from the experience. A simple bird chirping sound or leaves rustling in the wind are so important for a game that wants you to relax in nature. Walking up to the lake, I should've heard something. Either a calming sound starting, small waves and water sloshing, bugs buzzing.... anything. These sound implementations can take like half an hour and should've honestly taken priority in a game with this focus.

What I did like:

The music box was a cool implantation and surprising in a game made in a week (but it worries me about your priorities when making the game considering all the stuff listed prior)

Birb hehe

The overall environment was pretty if it was a screenshot. It being completely static is a bit eh though. A slight breeze for the trees or a flower or two would make it way comfier.

Textboxes/font felt good

Hoped this helped for your next project. It's important to learn and have respect for your own time/effort, otherwise you can waste time redoing past mistakes that take away from your portfolio.

I don't know if its something here but the frame rate was really low, I like the idea of being able to change the tune :) although the music volume could be a little lower. I see you did it alone, good job that is a great achievement!