I finally speedrunned Chuck E. Cheese's Sports Games and ready for requesting, but one question, I failed on the last minigame, is it still allowed?

You should ask in the forums from the game, or their discord. No one on the general discord knows anything about Chuck e cheese.

And a few mistakes here and there

No, I don't have a game page for it.

Ah, misread that. In that case, I've answered you in DMs. But basically, you're going to be the boss, and need to be the one responsible for the ruleset. If you are asking for my advice; how does the rest of the game do that. If you fail the 2nd minigame, can you go on to the next or need to retry them? In the case of retrying, I feel like it has to be the same for the final minigame.

But again, you're going to be the one making the rules, alongside a community for the game if there will be one.