Yes it certainly has been a quick game, it's been very enjoyable to date, even with the mulligans lately which, as you say, are close to running out. Mind you those remaining are concentrated in the south of the map, so they may all be used in a rapid flurry like ours were
I agree I've had the better of this extra mulligan in terms of our war, but I don't think it is pivotal at all, unless you have something elaborate cooked up that will be effected by any changes in this turn