Time to completion: 10-15 minutes or shorter
Fridgetopia has been described by the author as "mechanically utopian", in that it doesn't necessarily sketch out a utopia per se: there is not much world-building here. But this is not a slight against the game. Rather than describe your interactions with a specific space or time, Fridgetopia instead gives you tools with which you can create your own world, to a certain extent.
Fridgetopia is very short, and perhaps not very polished. It reads as much as a coding exercise (albeit an interesting one) as a game, but it does hide at least one secret, which... let's just say it deserves the label of 'fridge horror'. Very clever.
Time to completion: 20-30 minutes
The Shape of Our Container is a peaceful, conversation-led game about lying in the grass with your loved one. Similar to the other tiny utopias, there is a broad sense of forgiveness and peace. Structure-wise, the game has a broadly branching time-cave structure, allowing large variations between play-throughs. This gives the impression of living many parallel lives, of the impression of time passing.
Container is definitely polished and has fairly high replay value. Short, tender and intimate.