WOWOW! This is sooooo engaging! I love the idea of a sorting game where you constantly add mechanics and new sorting rules. This game is really addicting. I had to force myself to not go "one more run" so I could move on to other games haha. I think it could be cool to add a rogue-like twist to it, where each run you get 3 different rules throughout instead of the same ones, but this way adds some speedrun-style value to playing the game over and over. I think the one thing that could be improved the most is the difficulty. At the start I wish the packages fell slower and less frequently and then ramped up coming into the new rules. But the most important feedback I have for you is to LAYER NEW PACKAGES BEHIND THE OLD ONES!! This would give the game less of a "ah I gotta dig to go find the first package that landed" and more of a "first in, first out." feeling, making the game feel more overwhelming (which I assume you're going for).