Shin Megami Tensei IV

Are they all from the same developer?

Yes, Atlus...

Didn't ATLUS close down recently...

No, they're still around.

I thought I was ready to do battle with the Minotaur, but he kicked my party's a**. He just keeps spamming physical attacks, and there are no demons with resistance to physical attacks available this early in the game. I traded Bufu for Spirit Drain, and now I'm paying for it.

How do you defeat the lizard dragon thing that appears randomly in the 8th stage?

I'm not sure which location you're referring too. I'm still building a party for Medusa, at the moment. I'm not very far into the game yet, because I've also been playing M&L:DT.