Animating everything would also be nice. You've already did an awesome job on the UI overall ;).
I've seen much worse stuff from established apps on the Play Store. Worked on one even. The designers had the displeasure of doing glorified skinning. On top of that there was a lot of bike shedding around buttons but pretty much everyone ignored the dark patterns that were dictated from the top ("Hooked" had to be our new Bible, thankfully we didn't have to read it except for a 4 page snippet explaining the addiction loop we would want to exploit).