CandyFace
You can resend your key by following the links on the Frequently Asked Questions page. I'm going to list them here for convenience but please remember to look at the FAQ page or search before making a new thread, as the question have most likely been answered before :)
If you bought Pyxel Edit with Paypal, use this link:
http://pyxeledit.com/get/resend.php
else use this:
https://www.humblebundle.com/resender