I started playing Demon Gaze too. I was having fun until the first boss. I must be really under leveled. The game seems ok, but between DRPG not being my cup of tea and what seems a grindy design I don't know if I'm gonna keep on playing. But hey at east I enjoyed several hours and it did not cost me much.
Mars was hard for me too, I had to grind a bit. It gets considerably less grindy afterwards.