Math Bomb

My first android app or game, where you have 10 sec to solve a math challenge. You have 3 chances(lights) to make mistakes or the bomb explodes.

There is also a custom level where you can choose which operator(sign) and which values you want to practice.

This game is free with no ads or hidden payments. Hopefully someone might find it useful.

I would appreciate any feed back, especially if something is not working. Seeing that this is my first android app or game, I need your feed back to learn what to do for future projects.