Env custom reward explain

[CVHvn]

I see that you created a custom reward env. Can you explain why you use it and the impact of it compared with the standard reward from library?
Additionally, I see that you modified the custom reward (maybe to solve 7-4 and 4-4 levels) compared with your custom reward use in A3C.
I think you should explain the reason and importance of your custom reward. The more successful level may be because you use a better reward system not only by better algorithms?