Hi, thanks for the kind words. We're really happy to receive such comments, they make our day.
About the balance, it's pretty much non-existent, i.e. we aren't taking a serious approach to balancing the skill modifiers just yet, so some runs might go really crazy. The throw sand modifier that blinds all enemies is indeed a bit OP at the moment, which might be because most enemies are melee and ranged at the moment.
When it comes to the mana-neutral attacks missing, are you referring to a character in particular (i.e. the magician lady) or to all characters in general? Bash starts with no mana cost, but I can see that, once upgraded with something that increases its cost, the warrior can end up having to pass turns to gather mana, and that can be not so much fun. About the additional resource pool, it's something we'll brainstorm about in the future, but likely not soon.
>I had some trouble understand the different buffs and effects, it gets too crowded there for my taste
Could you go deeper into this? Are you referring to a skill having lots of skill modifiers or a particular character getting many buffs/debuffs?
About bash & the weakness modifier, I just took a look at the description of the modifier and indeed it does not state how many stacks of weakness it gives, will be fixed by the next patch. Thanks for pointing it out!