i like final fantasy 7 side view and the active battle gauge. am i able to start making the game even though i havent setup the battle system yet?
thanks for help
Yes and No, it depends on what you really want to do.
Battlesystems are "setup" by including scripts, and many of them only change the display, not the battle mechanics.
If you keep with the default battle mechanics, there should be no problem choosing a battle script later (even if it's the last part of development).
However, there are a lot of scripts that give additional options to battle - for example, have skills conditioned to be used only on special enemies, scripts to do different forms of targeting or damage, scripts that add summoned enemies/allies or that change the commands available to the player and more.
If you want to use any of those scripts, then you'll better set that up before starting work on affected parts. For example, most of those addon-scripts use notetags in the database for controls, and changing those after you entered most of the database might cause problems (if you forget one entry or if an entry is changed later or so on).
It always depends on the specific script you want whether you should set it up at the beginning or if you can add it later.
