This is my entry and @brobunnybrobro and everyone else watching this, I hope you like this
Thanks to @brobrobunnybro for the original project! I basically drew the duck and if you want to do a transparent square, make the outlines 0, then make an 8*8 pixel square, then click the square with a dark top and light bottom, the top one can be whatever color you want it to be and the bottom one is no fill. Next, convert the square into bitmap and you will see a gradient. Then, you take a small part of the gradient (not the whole part or it won't work) and then copy-paste it on your sprite and make it as big as you want. Now you have it transparent!
