You're getting a lot of feedback on the product... I'm going to give you some feedback on the site itself. I'm not a designer, but there's a few things that stood out to me when I clicked on your website.
First, there's too much text. The text is overpowering me.
I forget where, but there was an article/blog post a week or so that I read, which effectively said:
1. Assume your readers can't read
2. Assume even if they can read, they won't.
This means that ideally your site should be almost self explanatory. Diagrams > Words if you need to choose. If you can illustrate to me how it works, you're doing way better than having me read it.
Next, your choice of color is bad. Nothing really stands out except "by trying apps on your iPhone". That is to say:
"Earn money" doesn't stand out. Login doesn't stand out, and neither does Register...
Next, in the "Get paid to try apps" paragraph, the color scheme isn't "crisp", it's a bit hard to read IMO.
"Are you a developer?" Why yes I am! But holy-moly, that font is fine and i'm not even at the fine print yet!
Don't try to squeeze so much text onto your website :)
Next thing that stood out to me, is the >> Login/Register buttons. They have this odd white color to them on the left side and the top sides. It makes them feel like they were poorly photoshopped, and even though it's tiny (pixel wise), it's super noticable to me
Finally, you really have no "call to action". I arrive to your page, and I don't know where to click next. This is mostly because your Register button blends in with everything else. I'd probably make the registration red here to contrast with everything else (others may disagree, but I think the color needs to change).
Forget about the login button. your battle is against people clicking the back button when they first arrive. If they register, you've essentially got them to buy in. They'll find where to login :) (you can put it in the corner, or anywhere else really).
I hope this is useful, good luck! :)
edit: cleaned up my thoughts a little bit...