Hello! Yes, the cells are 24x24! This is to account for some of the animations where the character needs more space! For example, the jumping and punching animations! The character itself is, however, 16x16! I noticed the animations tended to feel stagnant/warped if I kept it in 16x16, so I took inspiration from older games to make sure the sprite stayed a consistent 16x16 size!
Thank you for the feedback!⭐And, do let me know if you have any suggestions!