I actually played a few more because it's really fun. Its still really difficult lol I tried to optimize it a bit, but I just keep finding that I cant clear the queue fast enough unless I have the auto queue clearing perk. I would recommend rewarding the player for getting to the queue in time, in one of two ways, restart the queue damage countdown whenever a customer is served, OR allow the player to clear the queue on a shorter timer so more people can be served in the same amount of time, more quickly.
I really enjoyed playing this so thanks, I hope you keep making games