2. You should still show something that actually looks like your game then...
3. The idea is to make it look good on a well calibrated monitor because all the different displays try to be the same, so it should look good on most of them.
5. What does grammar have to do with me playing mobile games!? And yes I play and even make mobile games myself, but for iOS. Also if you want people to review your game after trying it you should either make it free or hand out some promo codes. It's okay if english is not your native language, neither is it mine, but the images and text is the first thing people see of your game and if those already suck as much as yours, nobody will download it even if it is for free. You could start by fixing the layout and have someone proof read it, even if it won't be perfect, it is easy to make it a lot better.