This are the changes:

-Some improvements were made to the English translation.

-Cave exits are now easier to identificate.

-Mosquitoes are now less annoying (mechanically, at least)

-Elemental table became a bit easier to understand.

-Stronger enemies got distinctive overworld sprites.

-Some enemy attacks have more evade frames.

-Some enemies have lower stats.

-Items usage has now priority over any enemy attack.

-Game version now shows in the title screen.

-Some pins now require less PTS to be used.

If you want to upgrade your game version follow the instructions:

1. Extract the game.

2. Make sure you are not inside the caves (it could trap your character inside)

3. Move the .rvdata2 files into the new folder.

4. Play.