Feedback -
The modes are the only thing I didn't really like in the Alpha. I like the concept of Dominion, but it is very laggy. And brawl and Duel are pretty much the same thing, so you only really have 2 gamemodes.

Suggestions -
Like maps, having more gamemodes could be fun, although not too many. Also, I think the tutorial could be improved. Right now it doesn't explain much. If you could have a slower and more informative tutorial, it'd be easier for new players. Practices could be useful too. Not bot practice, but drills. Have a gamemode where you can simply train to block or attack with an animated dummy.