The light blue color and that background color are almost identical, making it hard to make out the outlines on sprites that use that one without using another version of the sprite as a guide. I wouldn't call that "simply perfect"

It isn't quite a problem for me, but I can easily see it being one for others.
Unless you make the bg colo(u)r transparent, something like this isn't quite easy to fix, unfortunately.

although I was just saying the description is extremely boastful.

That's exactly the kind of person Arima is; he's stuck in this mentality that "perfection is everything and anything less should be shunned". He thinks everything he does and says and believes is perfection and then he gets whiny whenever his sheets get replaced with better ones, like when they replaced some of his SMAS SMB3 rips on The Spriters Resource.