Is this a blunder ?

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A Quick post after a surprising finish to a game I just played
lichess.org_rafegts7dwuw.png

I played black and this position arose, roughly even, but whites pieces looks somewhat passive.
However I could not have foreseen my opponents next move.

lichess.org_rafegts7dwuw_1_.png

g2-g3, but wait is that a mistake ?
If so how can I take advantage of it ?
Can you solve these questions ?
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lichess.org_rafegts7dwuw_2_.png

Yes Qa7!! After this move my opponent resigned.

Is this a blunder ? | Ecency