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Just another feedback! I would keep the effects in general on a separate layer. 

I personally do my effects through a particle system or instantiated prefab so enabling that work flow will widen your audience. This applies to the whoosh on archers or an impact visuals on melee (like the were bear slam). It also applies to the red blink (I tween these). I would keep them, just sorting them out to a layer in Aseprite for a quick hide would go along way for some devs. This might be considered a more modern dev workflow vs static sprites doing all the work. When they aren't on their own layer and they overlap the sprite it's a pain to pull apart, almost enough to avoid using the sprites unless you plan to fully commit to that style alone. This would be the difference in my being a 'bought every pack' person vs a 'big fan that doesn't buy anything' person.

I think your stuff is great, I wouldn't go too far out of your way on my opinions if your vision is set but I like it so much I thought I might over share my feedback. Good luck! I am sure this series will do great.