"la jugabilidad inmediata"
"agrega cierta variedad a la jugabilidad inmediata"

"moment-to-moment gameplay" is quite a complex term and I would argue is confusing even to native speakers.

Here is a link to a discussion about the term: https://www.neogaf.com/threads/moment-to-moment-gameplay.105...

I would recommend you watch the first minutes of this Youtube video where a gamedev explains what "m-to-m gameplay" is about: https://www.youtube.com/watch?v=CPJNa6bHCGc

To put it simply, moment-to-moment gameplay refers to the gameplay the player has right in front of him/her, what he/she is experiencing at the moment, a combination of what he/she perceives, the commands he/she inputs and the game´s feedback. As an example, in Mario 64, core gameplay could be described as platform jumping. But the moment-to-moment gameplay would be to avoid obstacles and enemies and to reach certain places while handling Mario´s movement.

I know "Jugabilidad inmediata" is not that common a translation for the term, but I believe it is accurate and easy to grasp for the average Spanish speaker. Moreover, I personally dislike the literal translation of this term ("jugabilidad de momento a momento"). It is like people are going out of their way to make the concept more difficult than it needs to be. But again, that is my personal opinion. If you are more concerned about frequency you could use "de momento a momento."

RAE inmediato: https://dle.rae.es/inmediato

Regards, I hope this helps you finish your translation.