The first customers in your game reminds me exactly of Weebl and Bob (they even say, "Hey," the same way, when entering the diner):
haha that's awesome. I actually didn't make those characters originally, so not sure if it is inspired from that.
Made by a Twitter friend, AceWay (credited in game and description). Found the original sprite and tweet here: https://twitter.com/acewaydev/status/928720668878925827