Yeah, I saw this article but I'm still worried
I think that luck is also a factor of sales. You could do a lot of stuff to make your game better, more visible, etc... If you don't have a little more luck or an amazing PR, it could fail.
Knowing that most indie games fails, I'm prepared to failure
It's just a month and a half that I started talking about the game and I've not received much feedback.
I post the devlog on 8 different places and post updates on twitter, reddit and imgur.
I wrote 5 posts + 1 article talking about how Doom inspired my game + many tweets, reddits and images posts
As for now, I received 14 feedbacks on a shmup dedicated forum, and 3 comments on other sites.
Adding the followers and commenters, I have around 35 potential buyers, plus around 1300 consultation on indiedb.
D.O.T is maybe not attractive enough. If you have tips too fix this, I'm ready too hear them
Anyway, this time I've decided to finish it and I'll do.
I put a lot of effort in personal PR, I hope I'll get something out of it at the end
And by the way, I want to thank all of you for your instructive replies