This game has beautiful art and great relaxing music. I like it and I want to give you feedback so I'm going to do some nitpicking.
There were a few small issues with the movement. I would personally like it if the fall speed was just a bit slower. I think it would help a lot with precision platforming and would fit the overall pacing of the game. I would would also make the glide slowly fall in an arc as well but that's just my preference.
I also noticed that movement gets a little jittery on sloped surfaces and I actually got stuck a number of times.
I feel like it would be more consistent with the other game mechanics if you could stand on the blue snails on the wall. I wasn't really sure why they were dying or if that should be my goal. In fact I wasn't really sure why I was collecting mushrooms or anything else other than the orbs. You might want to add more immediate feedback to the collection of those items.
I'm probably just too dumb for this game but after explaining how to plant seeds I never figured out how or where to do it again. Maybe add a prompt in the places it's available?
I also had a little bit of trouble discerning between some of the background/foreground elements and a platform elements. I only saw it a few times but occasionally there was a tree in the foreground that obscured a block I was supposed to jump over. This might have be a design choice but you could probably find a way to make it more clear. I would also add a shadow or something to any foreground elements that are blocking the view of the player.
Overall very nice work!