Free Android Game - Idea Rush

Any thoughts on what I can improve on my game?
 
It’s free on Google Play - https://play.google.com/store/apps/details?id=com.kylefigula.idearush
 
Unless the game becomes popular, it won’t be worth buying my own Mac and paying $100 a year for developer. Screenshot of game is from my school provided laptop.

Thanks for looking, and please let me know what I can do to make it better :wink: