Problem with Sprite size's

[Gors]

sprite resizing is never good, because it bloats/eats pixels that are important to its presentation.

the most you can do is to untick anything that smoothes resizings (it depends on what image editing program you're using) so it doesn't add unwanted in-between colors. But that means the result will look stretched/scrunched and ugly.

the best option, although complicated, would be to redo your sprite already in 32x32, as this way no resizing will be involved.