So I hit a bit of a road block: I went straight to prehistoric times as soon as I could (before even going to 1000 AD Medina), and if the game goes to the party select screen while I am in prehistory it gives me a black screen.
I avoided the black screen by just not go to the party select screen, but then when Ayla offers to join to help find the Gate Key, it forces a party select, so I currently cannot advance the story and retrieve the gate key.
EDIT: AAAAND now its not happening. False alarm!
A few bugs I caught:
-When Crono learns Wind Slash, the pop up says "Crono learned Wind"
-In the Prison escape, at the save point right before the Dragon Tank, there is a man that Lucca knocks out. You can loot him for 5 "Mid-Tonics," should be changed to Mid-Potions. This same NPC also triggers a dialogue with Lucca if you search him again, perhaps have the "Mighty Lucca" dialogue trigger first, and then also have the player receive the Mid-Potions, that way people won't miss it.
-The very first time Ayla joins, after choosing a party to go after the Gate key, Ayla says "C'mon Crono!" even if Crono is not in the team.
-When going after the Gate Key in prehistory, the bottom right tent has a man give Ayla "Tonic," should be potion.
-The dialogue when first finding Kino in the Forest Maze is a little garbled if Crono is not in the group. There was a lot of reference to "Crono's things" but then randomly they were referred to as "Robo's" things cause he was the lead. You may want to give that a look over.
So far I am having fun, awesome work! It is definitely interesting being able to go to prehistory ASAP!