1. You should use some antibot for example once in a few minutes user must pass an url shortener - additional money for you (try zap, uclick, 1link and others)
2. Invest in paid domain, it will add you more trust.
3. You should register with FaucetHub - addditional promotion and cheap payouts!
4. Make it more professional! Design should be better, add some sections, graphics, style!
5. Cooldown decreasing short links? When user pass short link he decreases cooldown by 1.
I think it's good list to start with. What do you think?

Thank you very much for the feedback, I really like these ideas.
The URL shortener could in fact make additional revenue, once per several minutes, and also the short links decreasing cooldown is a really great idea, I will actually work on it soon.
I will also consider registering into FaucetHub, because it would make the site even more popular, and people will be more happy with the smaller payouts.
About the design, I can still play with it and change some things, but the site is pretty much meant to be simple looking, that's why its
Simplysato.

And about the domain, I will for sure change it to something more trusted like .com or .org as soon as I will get the payouts from the ads.