I like it as a description. It dodges the "sounds like magic" bit but has all the right moving parts. The class mechanic then becomes manipulating buffs and debuffs in the battlefront. The size of the battle front and the die size of buff debuff are coupled to character level. Does that sound about right?
The only discussion point I see is the concentration part. I'm guessing that indexes the same rule as for spell casters? I'm actually ok with that because it allows us to bulk up some of the abilities a little because there's a risk they get turned off when you take damage.
We could also split auras and abilities into two groups, those that require concentration and those that do not. Similarly to spells it would prevent stacking of key buffs. If that's the model perhaps the battlefront itself doesn't require concentration, just some of the abilities that might affect it? It also means the players have to put some thought into which abilities they choose, assuming we give them choice, if they want to maximize their action economy. Much like spells we are free to go action, BA, or reaction, and either concentration or no. That gives us a lot of knobs and dials to adjust for balance.