Plants Vs Zombies - Air Raid (no mowers lost, no shop purchases)

The Limbo Page mini-game Air Raid completed without losing mowers, without shop plants and using only 4 slots. It is in fact possible to survive the early game with only Sun-shroom. However, it requires very optimal play and the RNG for the production timers of the Sun-shrooms and the RNG for the speed of the first Balloon Zombie both need to be favorable in order for it to be possible. The rest of the level after the first few waves should be easy - just spam Blover every wave and use Doom-shroom to wipe out the flag waves.