Quick thoughts after testing. Firstly I think this is a really interesting start and like how bold all the height is. I can see the inspiration from frontier with all the giant ramps to push up, but with frontier that's only for one point, and it's a hard point to push. Here I feel like all the way from spawn to the final slight downwards slope down it's like pushing frontier B. There's also so many flank routes that it felt easy for the defending team to loop around the attackers and appear behind them. I know it's only a1, but there were so many different textures used which, made things more confusing. More consistency might help. For a stage one on multi stage, it was pretty difficult to push. You might want to make it easier overall so that when there are more stages, players actually get to see the later stages.
Cool start though good luck :]