The music is good. It reminds me of playing games in the old days of Nintendo.
Gameplay is pretty easy to understand and I can't read or write Japanese.
Your characters fight monsters. As they level up, you increase their stats. Your points are not permanently spent. You can reallocate them at any time.
As for gear, there's a few varieties. Personally, I like the 300 speed shield.
I've played long enough to clear the game and both post-game stages. Sitting around level 550. :)