One of the most challenging elements of Legend of Dungeon is timing your shots right to hit enemies so they don't hit you. I am pretty good with most of the early enemies except Snakes. I can sneak up on them from behind and hit them once but if they charge me I nearly always take damage. Bats, Gnomes, Zombies, etc are not a huge problem but ... the blasted SNAKES!
That said, the game is an amazing amount of fun and I enjoy getting items i've never seem before and seeing what they do. And when I hit floor 12+ you will be the first to know :D
If you are looking for another good synopsis of Legend of Dungeon, checkout this recent post by someone on Reddit on how Legend of Dungeon should be a template for other game designers.
http://www.reddit.com/r/LegendofDungeon/comments/1ht7f8/why_legend_of_dungeon_should_be_a_template_for/
