You could try saying:
>
* If there is an official Japanese word or a common Japanese colloquialism used to refer to the time in game, replace with that word.
* Since it's a video game, you don't need to worry as much about formalities like , unless you feel like you are asking for a lot. Most people don't use while playing games in my experience.
* literally means "time is up"
* Volitional Form + is a grammar expresses that there is little observable evidence that something will happen. By combining this with the potential form of we get "I do not think I can defeat ", where you and the enemy are both contextually implied.
* I elected **not** to use because the words necessary to make a sentence using would for a slightly longer sentence, which I assumed you would rather not use. Refer to the example below:
>
Edits for shortening explanation and adding the last bullet and example sentence.