An out-of-character message from the developer in-game states that "This game is not a game. It is a portrait." The person it portrays is perhaps relevant to many who read this review - but it is in no way supporting of morbid things such as suicide (one doesn't have to relate to appreciate the Actual Sunlight experience, but someone interested in psychology and / or mental illnesses will probably be intrigued by Actual Sunlight.)
The out-of-character message was added to explain his concern for who comes across the game and possible negative reactions (or triggers, if you prefer) - and to switch and say out-of-character "That ain't you. So don't. Don't you ♥♥♥♥ing dare." (Here you have to remember what the game deals with - i.e. suicide.)
I agree with the reviews shown on the shop page that are taken from other sources than Steam reviews. It's a powerful portrait, perhaps because the developer refers to himself in the out-of-character message.
I recommend it to people who are not searching for the common perception of "video game", but a psychological experience. It would also have to be someone willing to pay its worth (base price 5 EUR / USD) for a short amount of game time. Few people will spend hours on it (including those who do several playthroughs, even though there's not really replayability), and most may just spend minutes on it before they complete the story and catch the point.
However, before considering buying, follow the trigger warnings. How do you react to powerful depression- and suicide-themed novels, music, real-life stories or whatever?
Actual Sunlight deals with serious topics, and I'm not sure how much courage it took the developer to create this. All-in-all I appreciate the developer sharing this portrait and do not regret my 4.49 Euro spent on it, but rather would do it again and will look for other interestingly-named titles from Will O'Neill.