Do you like or dislike the banner being a GIF?

Normally, I would dislike it but it looks neat here.

Is there too much text?

Yes. It is a very simple apple / leaf collecting game, so there is no need for a page-long description. The text that summarises the game should be at the top of the page.

Are there any information missing?

The plural of "leaf" is "leaves" not "leafs". I'm not sure whether this is intentional. Also, the bold / regular text is too jarring.

Would you like more screenshots/GIFs?

No, they are fine.

Do you like the colors?

It looks a bit too pale in my opinion. The apples could do with being more red and juicy.

my game-page does poorly in converting views to actual customers

It has a minimum price of $2 for what seems like a little project so this doesn't surprise me. Although, the game does look quite satisfying.