Nice game
Feedback:
1.)Add some momentum to your cube.
2.)Add a wind gushing particle effect.
3.)Use a skybox .
4.)You can also add a gun to the cube to break through the breakable obstacles with slowmotion.
Overall Very nice game Keep it up.
also if u want to learn how to make a FPS character inside unity
watch this
It is an addictive game.5.) also add a distance travelled thing like in subway surfers.