I love the artwork for the character! As for more critical feedback, the camera needs a lot of work. One of the biggest mistakes that a lot of newer developers make is something called a "blind jump" where the player can't see what's ahead of them, they just need to jump for it and trust that they land on something that doesn't kill them. As for this game, the bottom of the camera scrolls above the floor with every jump, making every single jump blind on your way back to the floor. It helps that the end of levels have text that lets you trust that the fall will clear the stage and not kill you, but there are a huge handful of sections where you just need to move downwards and trust that you don't fall and die, as you have no possible way of knowing if there even is anything below you.
Other than that, the tongue physics were fun, and I liked that you could charge up a super jump. Just make sure the player can see where they are going in the future! Nice work.