The only "Halo" thing about it is Sci Fi.
As FPSs go, it's pretty damn different. ADS being a major thing, default sprint (although I admit that was in 4 but that's a different discussion entirely), enemy AI, basic weapon handling etc.
I really can't see many comparisons you could draw to Halo.
What it screams to me is Borderlands. This game really does seem like an MMO take on Borderlands. Coop focus, very similar looking combat, very similar RPG style mechanics, a focus on loot, medium sized areas interconnected areas to explore.
Make the game cel-shaded and I would believe that this is a Borderlands spin off.
funny, i see a larger scale reskinned halo with an unnecessary ADS and space magic. the core gameplay looks very very similar. i'm not knocking it btw