Prison Life RPG was first released on iOS on 26 Feb 2015, follow by GooglePlay Store on 1st April. Priced at $3.99 USD with no IAP. 

Prison in 1 sentence: Play as any one of the 100 prisoners, survive harsh prison life and escape! 

About me: I am a full-time indie game dev since 2008. For all games I did everything myself except music. Prison Life RPG is my biggest project(gamble) which took over 1 year full time to make.

APP STORE
GOOGLEPLAY STORE

Powerful Effect of Famous Let's Player

First day iOS sale: 416 copies. It was not featured anywhere on AppStore.

I was disappointed by the launch sale as we all know first day is usually the biggest sales day. I thought my 1 year+ of hard work was doomed and I had to look for jobs. 1 week after the game was released, a popular French Youtuber fantabobgames made a Let's Play series. 
FantaBobGames: Let's Play Prison Life RPG youtube series in French 

Release on GooglePlay 

I released the game on 1st April, 1 month after AppStore. I never expected GooglePlay sales to surpass AppStore within 1 month!

Some cool facts of GooglePlay Store Paid App:

GooglePlay vs Apple AppStore

I was a big App Store supporter, and I thought GooglePlay Store is bad for Paid Apps. I was wrong!

User Review system: GooglePlay Wins!
GooglePlay Store: shows all reviews of all versions and countries, able to reply to each review and interact with angry customers. I believe the positive user reviews really helped my game.
Apple AppStore: each new update reset to 0 ratings. No way to contact users. Life sucks if you(buyer) live in small country as you can't view user review of other countries. 

Purchase and Licensing: Apple AppStore Wins! 
GooglePlay Store: Everyday I recieved at least 10 angry emails/reviews due to GooglePlay problems such as failed to download game, failed purchase, failed to download expansion file, failed licensing check etc 
Apple AppStore: Never have any problem. 

Updating Game: GooglePlay Wins! 
GooglePlay Store: Daily update? No problem! 
Apple AppStore: Wait 2 weeks for App Review, and reset user ratings to 0. 

Top Charts and Game Discovery: GooglePlay Wins....?
GooglePlay Store: Top New Paid/Free chart is great for new apps(less than 30 days). I hope Prison Life RPG can maintain the sales after 30 days. But without App Review, indie devs have almost zero chance being featured on GooglePlay Store.
Apple AppStore: Even if you are being featured by Apple, it only lasts for 1 week. I hope Apple can add a 30 days Top New Paid/Free chart. 

Why GooglePlay out-sell AppStore:
The game benifits from Let's Player fans on both platform. On App Store, the effect stays in France. But on GooglePlay, thanks to the good review system and 30 days New Top Charts, it has spreaded to other countries.

I believe it is better to release on Apple AppStore first, then release on GooglePlay only when you have enough people waiting to buy your game, and boost it up the New Paid/Free chart. 

FINAL THOUGHTS

Releasing game for iOS is like lottery, and to invest 1 year into development is a huge gamble. I didn't won the top prize(Apple Feature), but I got the 2nd prize(fantabobgames). The money has covered my last year's expense. I will be improving further on the game before moving to the next. 

I consider Prison Life RPG as very successful on GooglePlay Store and above average on App Store. Yet I am still far from becoming a millionaire:( This shows a Top Paid mobile app is enough to support an indie dev, but probably not enough for a 3+ headcount mobile game studio. 

Thank you for reading, Lights out! 
Warden 
Follow the Warden on twitter: https://twitter.com/nobstudio 
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UPDATE 1: as expected once the game is off Top New Paid after 30 days the sales dropped significantly.