As I currently haven't time to create the description post I can use the time to give another hint, than I have some catch-up to do:
a) Fight with knights, mages, elves, thieves or… merfolk?
b) Control your armies one turn at a time.
c) Turn-based tactics on a hexgrid with units able to level up and turn into advanced classes.
d) Got updates and extensions for more than 10 years.
e) Fight in a Tale of two brothers Under the burning Suns for The heir to the throne.
f) More than 15 official single-player campaigns, many multiplayer maps and tons of user-generated content.
#34 Guessed by The_Liquid_Laser: Dragon Quest Builders
#33 Guessed by The_Liquid_Laser: Pikmin
#32 Guessed by Farsala: Final Fantasy X
I went ahead and had Google help me with #35 (since there are 6 clues and no one has gotten it yet). I think it's The Battle for Wesnoth.