hi Majid thanks,
yes the things you see on youtube or in other posts seem to be quite true, for the moment it seems to be stable at around 20 sales a day, which for being without any marketing seems good to me, however the price is 1, with prices more high I don't know but I think that even if I had put 2-4 the result would have been more or less the same ..
there are a lot of variables, but I think that after the first week of visibility the traffic will be back similar to when it was in arrival before the release, maybe 200 views which means maybe one sale per day and decreases over time .. lol
I will do an update in a few weeks, but yes, it seems that if the game is good it can be successful even without any marketing, with even a bit of luck it gains popularity thanks to word of mouth from people who play it the first few weeks or youtubers and streamers,
there are also some tricks, like a multiplayer game with a lot of duration has more possibilities than another type of game because of things like "your friend is playing this"etc. .
I don't know, we'll see.. marketing remains very important before launch anyway :)