Did uses some tricks to optimize search ranking for my first app. As for the second app, did some not so subtle advertising for it through my first app. Audience was similar so it climbed up quickly.
Overall = 1,700,000
Daily = Around 20k right now.
I would advice you guys to just focus on one huge idea instead of trying to make 20 copy paste apps. It's the quality that matters the most, specially if you are up against established players.
If your app/game is really good, Google's algorithm will automatically take it to the top.
Although some copycat bastard made a worse copy of my first app and his copy was downloaded 4 times more than my original app. That experience also taught me a thing or two about ugly marketing, which i had completely ignored at first. Only advice from meDo whatever it takes, you don't have the skill/money to play fair against big players.
20 app 25 dollar/day
I notice everyone who didn't make it yet, first dreams of buying a car... or something shiny.... can't blame ya, that's what i did too, but it didnt get me anywhere. If anything, it distracted me even more than I already was. No, you are not gonna be a cool kid on the block, you're only gonna piss off people. No, you are not going to magically get all the girls either, no matter what car you have. Stop chasing that stupid ego shit and make Candy Crush Saga sequel, then buy yourself an island and retire.