Better quality version than the original one which was made by original author himself. Original one on pixiv ugoria page had like 600*400 resulotion but somehow this separate gif upload has much more higher resulotion and good quality than original pixiv ugoria work.
You can't improve upon abubu. What you should have done was upload the swf.
This is perfect looped version compared to swf version where you need to click the swf to reset loop which was the reason why I didn't upload it in the first place. Plus as I said above I didn't made or as you said "improved gif" by remaking it. These two gifs made Abubu himself, not by me. My first post was remade by me on photoshop and it was taken from ugoria source directly. I think I will give source to the links that he gave on his pixiv description instead just give direct source to the work itself then.
edit: Mind you this wasn't originally flash work but rather ugoira animation so I think he later made these two gifs and separate flash version additionally so you have to give source to the original ugoria page rather than giving direct links to swf or gifs that he mention in the description section so I changed back the picture sources to ugoria page again.