This game was extremely short but very lovely, definitely an interesting concept that was very enjoyable. I'll sum up the arguments for my rating below:

(+) Visuals: The artstyle is extremely artistic, probably due to them being ''handpainted'' and overall having a very painterly style. The characters are drawn in a style similar to anime.
(+) Sound: The music and sounds are very lovely. There are not really any narrators or voices, but I think that supported the cozy atmosphere.
(+) Puzzles: I think the puzzles were not too hard but also not too easy, but they were really innovative and i enjoyed the variety and thoughts behind them.
(+) The story was short, but very touching.

(-) Length: The game was extremely short. I finished the main game in about an hour and a half and the DLC was around another hour, and I really took my time, so it is possible to finish it in less time. For the price (especially considering that the DLC's also cost extra money) it is just not really worth it. I'd recommend to get it in a sale.
(- -) This certainly won't concern everyone, since it is about the achievements. There are not many of them, but you certainly won't be able to find them on your own, because they are just really pointless. Many of them are things like ''click on x ten times'' or ''stare at y for this many seconds''. I love achievement collecting, but this just felt like a task. Especially because most achievements are extremely missable and you will just have to replay it to get them: Cutscenes are unskippable which makes the entire progress tedious.

This leaves me at about three stars!