First of all I want to say thank you for a great game!
I have played about 3000 Encounters and I already have quite a bit of experience with the game. I would have a few ideas regarding the game and for the leaderboards.
1. The game is free, why not bet on character outfits and weapon skins? Most of the paid outfits are really really boring, I understand they have to be style for a certain period of time, but to them if you invested could bring money to you? (of course I think that money would go to developing the game).
2. Statistics would be really nice to see more how many kills there are with different weapons on different maps etc. How many times have you been a threat.
To the end yet, you are doing a great job and I hope we get to see an even better VIGOR game.
