I draw the sprite in the built in sprite editor and it looks crisp and good. But in game it just gets blurred to bits.
On your project properties, set filtering to Point instead of Linear. Also, depending on the type of game, pixel-rounding to On may help so you don't get sub-pixel movement.
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what is the size of the sprite?
check your game's resolution as well.. it may be "zooming in", and the image might be really small.