Thank you for your comment.
First of all, I am a ordinary college student and was born in a poor family, therefore I have no spare money to use on my works, I didn't crowdfund the game also, the game is free too, MED purely is made for fun and improving my programming skills, I've done my best, can't provide any sprites for the game becasue I never learned to draw, I also have no willing to save up for commissions. Later versions probably won't have sprites either, but if any players volunteer to provide sprites, I'll consider adding them to the game.