Yeah, Heart+Vial was amazing! 14 hp every few seconds was basically essential in the last boss battle.
About Strigeye, yeah, they are very cool, but I would still like to attack enemies first and boxes after XD
About the stack and the names, I get it. It's not easy. Uhm... Maybe you could simply put a "(stack)" next to the effects that stack? And the others are implied that refresh, not having stack? Dunno, just an idea.
For example, Pyris' Ignite was also weird to understand in the beginning. I did not understand it stacks until I saw its ability that make explosion, in which it says they stack.
Also, it's not clear to me if same name effects from different sources stack, like Pyris Ignite and Dragon Scale Ignite. Are they the same effect? Does Dragon Scale combo with Pyris?