[Grammar] This video shows the bad ending since not enough keys were collected ...

[emsr2d2]

How about:

It is hard to tell if the player wins or loses when the final result is undecisive​?

Don't put a space before a question mark. It should be noted that "undecisive" is not commonly used, in BrE at least. My spellchecker underlines it and I had to look it up to check it was even a word. It's generally shown as "alternative spelling of indecisive".

 

[Tdol]

Does this sound better?

It is hard to tell if the player wins or loses when getting an unsatisfactory ending.

Not greatly to me- an unsatisfactory ending is clear enough to me.

 

[kadioguy]

Not greatly to me- an unsatisfactory ending is clear enough to me.

What do you mean?

In the post you quoted, I did have used the term "an unsatisfactory ending". :-?

 

[emsr2d2]

What do you mean?

In the post you quoted, I did [STRIKE]have used[/STRIKE] use the term "an unsatisfactory ending". :-?

See above. "did have used" is wrong. Say either "did use" (if you need that emphasis) or just "used".