Addition game demo (A Game a Day: Day 16)

The demo is a very simple addition game demo based on a Udemy construct tutorial. Try to select as many correct answers as possible within 30 seconds.  

Controls: Click the correct answer

This is the 15th game of my Game a Day challenge. I'll be making a game from scratch every single day until July 1st. To learn more about it, click this link. https://anxietymonstergames.wordpress.com/2018/06/01/a-game-a-day-blog/