I loved this game—would love to see more! I had to play because I saw it was also a slime game.
I loved how intentional the graphics were with a small palette, and the art was very cute. Mechanics were cool and definitely matched the slime's form. I also liked how the end of the pipe was shaped for the player to jump on it. I wasn't great at combat, so I liked how forgiving it was with being able to gain more hearts as well as respawn.
One thing I suggest is to have the jump button progress or end (but not initiate) an interaction, as I sometimes found myself trying to jump instead of pressing W to close the text box; If I tried to map the interact control to space as well, I would not be able to jump near the interactable object.
Overall, cute game and my favorite so far!