Here are my thoughts;
I think the gravity of the air movement should have a little more weight it's a little to floaty
I think that the mechs should be able to be spawn in by a team and not just spawn on the map. A team with two mechs is very annoying to play against.
I think that maybe putting a setting to choice between aim down sights or traditional halo aiming. Ik that you guys want to be traditional to halo but I do think for modern science would appreciate an aim down sight.
If sights where to be added, I think that only circumstances sights should be on certain guns. Like smg has old 1x to 2x scopes same with assault rifles, and long range long scopes. I don't think you'll add this but I just wanted to make a note to it.
Hammers have a little to much range when locking on to players
For casual play add a type of attrition mode but with maybe with flying drones or something like that.
Add flora like maps, and lively map design. The one map that I liked and remember is elevation. I think that that's the one with all the flora and the middle bridge area.
Different melees or secondaries. I think just having the hammer is a little too chaotic.
For ranked maybe make the ball deposit the ranked mode with rounds