It's a grind fest...
But that's the challenge. This game is a test of your will, patience, and determination. I just finished all 100 floors. When you get the right items late and stock up on large health potions, I just sped through the last 30 floors, though I worried when the Golems appeared until I got the items needed to cut their 100 damage per second rate in half to continue on all the way to the end.
If there's any critique it is the poorly implemented inventory and shop system. The design is reminiscent of early RPGs and that's bad.