Hey Lennis, I'm starting to read through this -- just scanning all the posted chapters right now and I'll get more in-depth as I sock away the time. It's dastardly of me to comment on your writing as it existed years ago now, but I just wanted to say:
1. I'm really impressed with the world building that went into this project.
2. "Lu" is an awesome nickname for Lucca. Now I wish it were in-game.
3. As for pushing your writing further, I'd focus first on minimizing the passive "was" and "were" in your prose. Not because they're weak
per se, it's just that I think colorful things happen when a writer tries to work with that limitation. Two years can be a lifetime for a big project like this, so it'll be really interesting to see how you've evolved in subsequent chapters.
The way you start out by pulling back into Crono's childhood came as an unexpected surprise for me. I wonder how much you must have agonized over how to begin? Did you toss and turn over it, or did the opening present itself immediately?
Chrono Trigger lends itself to so many possibilities. I probably would have been tempted to kick off with something mysterious or action-y -- Magus conducting a seance, Crono pulling out a can of whoopass on Gato at the Fair, etc. Beginning anything serenely and world-buildy is just a fear I have as a writer. Which naturally means I should try it again sometime!
Ooh! And before I forget... Videogame adaptations being as interesting as they are, I want to recommend to you
Jeff Rovin's treatment of Mortal Kombat. I'm not widely read outside fan fiction when it comes to this sort of thing, but that one got me particularly fired up when I was a kid.