Hi.
I think your game is damn good. If you want some suggestions about further improvements:
- At some points you can't progress if you haven't taken certain milestones. Give the (illusion) of real freedom; allow the player to leave a room by accepting everything, but maybe remove the option to stop growing if this is done everywhere.
- Kick off the explanation at the end of the game (starring:). "Show, don't tell!". Really, your game doesn't need it.
- Some sounds could profit from a slight re-balancing of loudness, some might profit from a bit reverb. Not much, though - and your sound is splendid.