As a platformer it's very laid back & not very challenging. backtracking is occasionally frustrating without offering risk to justify it.
P.A: It doesn't need to include a fail state like death to induce a challenge. Even a minimal visual feedback would've been welcome.

The plot is pretty much "Inner conflict", and despite the whole presentation being abstract, it wasn't captivating enough to make me want more.

Artstyle is interesting, but my favorite element was the OST.

As a personal opinion, i feel that a game like Journey is the better, more matured sibling of Gris.

In short: Peepoo peepoo it's literally a metaphor for depression.