It is a cute app and I like the background picture. But for the app promotion, forum like this one is limited which will not help you more. I would like to share you more free and paid methods to boost app. Hope these may help you.
Exchange installs & reviews/Cross promotion
Once you published your app in Store, you can market it with cross promotion with other apps by installs and reviews exchange. It is free while it is still hard to find that publishers like you. You may try some Cross-promotion networks (CPN), Facebook group or exchange forums. And there are many groups on networks where publishers can exchange installs and reviews each other. However, generating installs or reviews from users will take much longer time.
Social media networks
Having a Facebook Page for your app is a must-have where you can ask them how they like your app designs and features and any get feedbacks. Also, you can share any news about your app, etc. However, remember not to make your posts only about your app, though. That is boring. It’s like talking to someone at a party who only talks about themselves.
Make a video
Videos shows great ability even just 30 seconds, it has power to show users why the App is worth a try. Make up a story of your app? Show the real life? Yeah, both OK.
Make connect with your friends and families. You may ask them to help you spread your app in their relationship circle. Also, participate in meetings or conferences that are relevant to your App, and make full use of it to build partnerships.
Buy app rating & reviews
One app can get reviews, it must get installs firstly. Reviews provider like BestReviewApp will guide real users to install app, play and reviews it with ratings. This method will rank app top in a short period. At the same time, the traffic is from real users which is organic. It will Not have bad impact on apps.
Run advertisements on some Android forums, Google ads or social media, it is one common method for publishers to promote app. But you know, there are many people browsing Facebook, Twitter, Instagram, etc. There are less targeted audience for your app.
Higher ranking is extremely helpful for app visibility. App can get installs from users directly via download link. Or drive install via keyword search. The former method is straight forward install amounts singly. While latter one aims at helping app ranking in App Store search results. Keyword optimization also will guide real users to install the app via targeted keywords relevant to your app.