The only good thing I can say about the Chinese version's level system is:

Sun Bean is extremely viable now.

First off, he doesn't level up like other plants; this might seem bad at first, but it's a good thing because of how much he's buffed in this version. Even though it says he's level 1, it feels like he's actually a level 3 plant.

Second, leveled up zombies have more health, and are able to give you a profit much bigger than before. By the time you get Sun Bean, you already have to deal with level 3 and 4 zombies. If you have a plant like Acid Lemon or any other strong leveled up cheep attacker with Sun Bean, you're guaranteed to get a mass load of profit - even with Basic Zombies!

Something else too about Sun Bean is that he seems to give you more sun in this version. Maybe it's just me, but it feels like the bits of sun you earn from zombies are worth more than in the international version. If that's true, then that's an incredible buff to an already great benefit from the leveling system. With the insane amount of sun you have, Tile Turnip also becomes more viable. It's possible to get 4 power tiles in a standard level with just Sun Bean and Sun-Shrooms (These things are broken as fuck too.)

One more thing: Sun Bean, for whatever reason, can be used in Last Stand levels. Unlike any other economical plant in the game, Sun Bean is usable almost anywhere! This can be a huge life savoir on those daily training levels or levels that adds extra bullshit like limited plant usage and Mold tiles.

If you have Sun Bean, please give him a try! He definitely deserves some more love and this really is his game.