I don't think you need to worry about people not wanting to play your game. It looks so cool that people will want to play it regardless of Christmas.
By the way, I noticed another small bug: the puddles of blood left in the air after killing mosquitoes remain in the air. I know that EFPSE can't create real flying enemies, and you have to use invisible barriers to create the illusion. But I think you could remove the puddle sprites or make them very small so they're invisible.
It would also be nice to replace the default bullet hole sprites so they don't clash with the overall style.
Well, at least I think you know better than me how to make your game even better