Ive never went through the trouble to give suggestions or feedback on a game because i've never felt that they'd be heard, but this being probably the most enjoyable game ive ever played, i really would love to see just a few changes on the game to polish it up.
#1 thing that's really bothering me right now is that ranked play needs help. The only way i find myself playing a game long-term is with a competitive ranking system, which you all have started on the right track. But the #1 issue is only one (duel) game mode (PLEASE bring back the tournaments). I nearly always play with one or two friends and id love to see a Brawl, TDM, and even Dominion or Siege ranked modes with the same ranking system as the duels right now. And a brawl ranked mode which starts players in two 1v1 arenas with gates opening after a period of time for the winners to fight would be incredibly fun for me.
Also a spectate mode would be really nice. Id like to see my buddies play matches without having to watch them on Steam stream. Also i always enjoyed a system like LoL had in its early seasons when you had the option to spectate higher tier matches (Diamond+) which would be a great if you all ever do decide to release a team mode ranked.