A fun idea, but i think needing more apples as the game went on would've made for a better difficulty curve than lowering the time. It might even work well if you have the time limit lowering every level, but be able to collect as many as you can in the time limit without knowing if you sold enough to beat the level until the store animation. Having to only collect 15 apples every round also made it so i didn't need to go beyond the first line of trees.