One issue might be your landing page for the game in the App Store.

The static images and their text descriptions do not convey what the game is about. e.g. Platform action, puzzle solving. The description section helps, but I'm not sure how many potential customers go past the images as a first filter.

As someone not familiar with your previous games, it wasn't until I went and looked at the video on your website that I thought that yes, this is something I would find fun to play.

I think the reviews coming out should help to attract customers for you. That is, it will be the review that sells them, and then they'll go and buy your game, rather than making an impulsive choice while browsing the App Store.