Are u so mad because u like the game and you struggled on the second route so u decided to write a more emotional post?
But consider that this game is completly free and is made by one guy as hoppy project.
There is some stuff that should help:
1) You can level up as many times as you want in the screen as long you don't reach the level cap or u don't have enough money. You can also leave the level up screen if you don't to level up a Pokemon.
2) You can also go back to the first route and grind there if the current route is to hard.
3) If you enter a Trainer Match you can instantly leave the battle and skip the trainer this way
4) Don't stay to long in the sun if you are made out of milk, else you will get sour milk.
The Tic Tac Toe reference doesn't make sense, till you can't loose in this game even if your opponent has the best strategy, because it simple mechanic and has zero luck to it and not really comparable to this game in terms of luck.
There is a guy who finished this game in round about 2:30h and that is not that much. The skill you need for this game is to grind efficient and this is one of the fun parts of the game.