Not bad. One thing I’d like to point out is that most the notes have the same volume, and it makes the piece sound a little robotic and unnatural. Check out Spitfire Audio’s Glass Piano; it’s a free plugin (you’ll have to install Spitfire LABS, which has tons of great free/paid stuff) with a few different presets, and I use it in basically all my songs that need a piano in them.

edit: @Marscael wow, you make all your stuff on a phone? I totally thought you had a computer! If that’s the case, just wait till you get one; once you unlock FL’s full potential you can make pretty much anything you want.