Thanks for the feedback!
Escape button it's used to exit fullscreen by default on the web version. This is why I used enter. I would like to change it to scape but I will have to disable the fullscreen option.
As for shooting while in pause you are totally right! Thats a bug that I discovered yesterday, but thanks for repporting. I was planning to fix it on the next update.
I followed you on twitter but I can't send DM to you. Maybe you have to follow me back? I just started using twitter now and I don't know much about it. When I can send DM I'll be glad to tell you how it works.