Hey, thanks for trying it out.
I noticed the first bug where it shows an error message after it sends the verification email.
I will look further into it andfix this issue.
As for shooting/attacking, you have to aim (the red circle that moves with the mouse) and click. simple as that.
You can click on the "Help"-button on the menu-screen to find the basic instructions like "Controls".
And lastly, as for the second screen that pops-up and plays the videos, I will work on it and make it play in the same window.
For me it was never an issue while debugging since I had just one screen/monitor and the video-window would pop-up and cover everything else below it.
Thanks for playtesting again. But I noticed you were not on the leaderboard yet?
Maybe its because you need to click the refresh button (the small green button) so your score gets listed there too.
I will look further into it and make it automaticly update the scores in the leaderboard.
If you encounter any other problems or issues, feel free to share. It helps me a lot!
I will shortly upload the updated version with the bug-fixes, so stay tuned!