What you should expect.
So... is it a "game"? If you feel the need to ask, no.
Is it disappointing if you expected a game as you know them? yes.
Is it interesting? If you like to think out of the box, yes.
Is it too short? Yes! No!
There are many posts about how short it is.
Like if "short playtime" was the ultimate crime a vidéo game could commit.
This is interesting, because it would mean that an "artist's creation" is giving you pleasure only during the amount of time it lasts.
When going for a movie, would you say: "what? movieA is 1h30 long and movieB is 2h45 long? For the same price, of course i'm gonna go for movieB!"
No you wouldn't. Because movie making is an art, and you will chose the one which will trigger the most emotions to you. And a good movie stays with you hours, days, months after your viewing is over. A good movie makes you think afterwards, not just enjoy the present moment.
How long lasts a painting? A sculpture? Duration is not how you quantify emotion.
So I think it should not be considered at all.
You can't be the same people saying video game is an art, and saying that you feel scammed by the length of a game.
In video-game-is-a-market world, duration is a criterion and a sale argument. In many AAA games, you will -pick one or more- bring a package from A to B, kill monsters you saw before exept they are now a different color and stronger, have to go back to a known zone legitimized by a poorly made scenaristic excuse, do the same copy-paste mission over and over...
That's because... well... duration counts in the press reviews and in the minds of lambda gamers, so when you buy a commercial game, there is an acceptable hours count.
And sometimes it's artificially inflated, resulting in a long but becoming-boring result.
So you play until you're totaly fed up, and then there is (often) no emotion left to live after you've stop playing. But hey, it's ok, the game lasts long and I'm not ripped off.
People complaining about duration are responsible for boring content in games.
There's nothing more disappointing that an overexploited good idea.
I think Thirty Flights of Loving is a study for alternatives to this drift, I think it's more like an essai, a reflexion about (amongst other) how can a story be told, what's necessary and what's not, and what should remain untold to arouse your imagination.
I even think the author made it as short as possible, as a concept. To prove something. To prove that some of the most widespread practices in video games are inessential, a waste of time.
Moreover, maybe some of you are used to get spectacular bargains on Steam, big games for almost nothing, and maybe now you're demanding.
You should not compare what is not comparable.
You should buy a game because you're interested in its concept, neither because it's long, nor because it's cheap.
Of course TFoL might look like non-professional work compared to what you might be used to.
Of course you won't really play, and of course it doesn't last long at all.
Maybe this work should be free, there would be no complain at all.
But if you think that enriching your way of thinking is worth it, if your mind is open to reflexion, if you feel like developpers like these deserve a little money because the future of video games will be better with them than without, you might give a few bucks and a bit of your time for it.