I just played the game, it was really nice : simple, soft and atmospheric.

Having recently played the Samorosts and Machinarium, I felt The Old Tree was pretty close to that kind of experience (which is very good). It was closer to the Samorosts to be more precise, the environment is less detailed, more abstract, more about the atmosphere/ambient rather than the tiny little details.

Btw, I dunno if the palm tree next to the elevator trick is a hint at Machinarium or pure coincidence :)

I also noticed that the game is pretty dark (dark as in display contrast), maybe tweaking it slightly up, or lightening a little some rooms would make it even more immersive.

Now, with the current game, I wish it had a little more "strange" elements, something playing with the "realist" part of its universe, like some slightly improbable characters or physics : a weird creature moving around through weird ways (like growing ephemeral legs/roots) and/or made out of two smaller organisms, some sort of vibrations/sound shaking up the gravity field (liquids go into bubbles or various shapes, while your character's form is changing, creatures gets bigger/smaller/wider).
=> More funny crazy manipulations of the game's world, so the players would look around and try to guess what sort of weird thing would come on the screen, being really curious about the unknown.

(ps: I know it takes months to add a single feature, it's just what went through my mind after playing it)

Thanks a lot for sharing it with us :)