Thank you! Didn't knew about zoom tool

It seems like each of these assets was resized individually - they all have stretching evident in the pixels, but the stretching stays constant as the sprites move up and down. By far the most impressive asset to me is the smoothly-resizing shadow.

Hi there, welcome!
Pixel Joint provides a zoom in/out tool, so you don't need to bother enlarging your pictures (except for specific artistic reasons of course)  

Very gruesome monster! The cocoon could use some more shadow though.