This is a very strong story-driven game and it's very interesting to see it as my team had a very similar concept - but very different execution. Let me talk of the strengths here: the best parts of the game for me are those that show, rather than tell - two highlights are the glimpse of Gabriel who appears right at the end and then fades away, and then the final lifting of the umbrella to release to the winds. I think you could have done more of that subtle story-telling, like when the flower emerges in winter, just show it and then show the character stooping to view it, maybe holding the umbrella over it protectively. Telling the story visually and reducing the text the player is required to read is my suggestion.
Art is strong, audio is there but room for improvement in perhaps unlocking more emotion in the music. Controls are very simple and game is very straightforward to play. Could have allowed for skipping animation on dialogue to help fast readers progress quicker. Great interpretation of the theme (though I would say that!)