First off, I just want to say this game is amazing. My whole school LOVES this game, and we are always constantly playing it. I'm very passionate about this game and I would love for you to hear my suggestions.
1) I would love to see a leveling system. The levels could unlock emotes, or skins, or whatever you want.
2) A log in function, so you could save your level, and load it on to another computer.
3) With an account, you could create a stat sheet, with kills, wins, deaths.
Anyways, I just want to reiterate that fact that this game is amazing. Please take these suggestions into consideration. Take care.