Amazing! Instantly wishlisted! Can't wait :)
Some suggestions:
- What about you add kind of like a berserker class that, as a last resort for example, runs into a group of enemies and pushes them away.
- Have something that heals other (Cleric or Priest or something)
- Move obstacles in the way so that it can become strategic to open packs or release them
- Have a booster pack that, over time, gains rarity and therefore gets better units or the unit inside gets buffed