At first, my game had a pretty good place at the popular page for a specific tags, that provided a huge amount of views and plays every day. Though, day 4 was pretty brutal for statistics and the game kept getting lower and lower on the page, collecting much less views. On the other hand, games, that released at the same time and had less rates and comments are still on top. This whole thing feels like it’s a kind of a circle when my game eventually is getting lower -> collecting less views -> getting lower even more.

Is there any tips on getting better statistics or on promotion in general?

Yes, as explained in countless topics, please keep promoting your games through other channels, because the initial boost you get from publishing your game is short-lived and not enough.