My PhD is made out of foam.
You wouldn't yell at a kid for colouring outside of the lines, or drawing a blue flower with yellow leaves, so so what if this Eevee mod is a little bit fantastical? Just leave it alone and move on.
Contrary to popular belief, the "just rate it 1 star and leave" mentality is actually less helpful than "harsh" criticism.
Criticism, constructive or not, should give the creator an idea of what to change for the future. It should help them learn, help them grow and make bigger, better things. While I do agree that just saying "it sucks" doesn't help at all, ignoring it doesn't even give the creator the attention they deserve for having finished a big project like a whole character addon.
In this case, Frostiikin did give actual feedback about how the abilities didn't exactly fit an Eevee and even suggested an ability. I really can't see this as "yelling at a kid" or unconstructive criticism.
While the creator does have a point that they can indeed do whatever they want to do with their character, they're also discarding criticism which is more hurtful for them than it is for us.
As for the topic itself, I congratulate you for sitting down and finishing the 200 or so sprites of Eevee, that is a commendable effort if anything - but I do echo Frostii's comment about the abilities not fitting.