The idea is really basic but if implemented correctly it could be rather fun. I've played many variations of chess like bughouse, antichess, random chess, etc. and each of them has something that creates a small element of strategy to them. Shotgun King is also another amazing game that uses chess as a basis for intricate puzzles. I definitely recommend you give that one in particular a play. For this variation, you just keep your queen relatively safe, kill their queen and win all their pawns like the wayward queen attack. It could be just that I come from an experienced background in chess, but it's far too easy. Maybe if there was only one pawn on each side, the game would last longer and take a lot more thinking. Or if a random piece became the "king" for that specific game which would give your game overall a bit more replayability.
Criticism aside, this is well-polished in terms of presentation and feel. Seriously one of the best I've rated in that department so far. Good work!