After reaching Alchemist level 40 by spending more than 23 hours of play time on very hard, this is what came to my mind
The fun:
1- Good graphics
2- Intelligent zombies that get you where ever you hide
3- having pet that carry items and run around to gather items and also it get very much useful by casting magic and selling items.
5- All Spells in the spell tree are very much useful
6- Easy one click spells activation ( that give the ability to do combo magic attacks by using mouse and keyboard...)
7- gems collecting
8- Wide collection of items and types
9- Summoning 2 robots and 5 skeletons lv6 and let the battles begins on the hordes of dragons.
Addictive:
1- Game play is very much awesome
2- buying maps to generate random dungeons to explore
3- trying to enchant weapons and armor ( i have this belt level 8 with only 4 armor but with + 5 attack speed + 8 to block +9 to finding magic items +24 poisons resistance + 15 dexterity + 10 strength + 6 magic +....)
Finally my wish list:
1- Better enchantment logic (so many non logical things happen there as this was the place of more than 90% of my spendings)
2- bigger store boxes maybe by adding tabs to the already have ones as there so many items that i like to keep for my replay with other characters.
3- Definitely more Spells in the spells trees for each level
5- a way to view details informations for characters status in the character window (informations like how much fire damage i currently do or the total of how much percentage i have of finding magic items...)
6- More varieties of spells to buy or dropped
7- playing a small story movies on each chapter will give it more depth than a stand still image with voice reading the lines (which i usually just skip)
8- adding more attributes to spend to the skill points (somethings like Intelligence may be to get more slots than the 4 magic slots or Personality... or Endurance... ( i reached level 40 with more than 36 points not used )
9- more clever puzzles to get the treasures