I came to this game with high expectations, having previously played Tethered by the same author. The Impossible Bottle is diametrically different in atmosphere and setting - the only thing they have in common is that, in both games, objects aren't what they seem to be at first glance - but this is another excellent game by Linus Åkesson.
This game is based on one single, very strong and very thoughtfully worked-out idea: (Spoiler - click to show)a dollhouse which allows you to change the size and nature of items inside the actual house, and vice versa. This reminded me somewhat of a similar mechanic in (Spoiler - click to show)Emily Short's Metamorphoses, except in that game the solutions felt a bit more arbitrary and random, perhaps due to the more mystical atmosphere, whereas in The Impossible Bottle they were more logical and easier to figure out.
After having struggled through a couple of fiendish (but deeply, deeply enjoyable) games by Graham Nelson (both of which, if I'm not mistaken, are referenced in this game: try chatting to Nolan at different points in your progress), I appreciated the 'merciful' rating of this one, not to mention the hint system, which gave out tips without giving too much too quickly.
The child-centred view of the world ("this room is the best, because it's yours") was sweet and funny, and once I had figured out how to make the game 'work' it was great fun to (Spoiler - click to show)move different objects and change them from one thing to another. And there is a cuddly capybara in it.