I love the 7MM-VPD-MHP doing the same missions as you, and sometimes you can help eachother. You can not harm another player unless you are in pvp crucible. They capped the character level at 20 but you can get an additional 10 "light" levels. It's somewhat confusing and I'm not sure I understand. But it's great fun. The game is small, it will release an expansion every three months for 2 years. So you can grow with the game. It's unique in that the levels are a great distance apart. A level 15 can not touch a level 16 enemy for shit. But a level 16 could mow them down. I highly recommend the game.