Oh dear, someone didn't get the memo. That syringe medicine was supposed to be INJECTED, not INGESTED! This set is imaginative. Could find uses among people inspired by Bowser's Inside Story, Ren and Stimpy: Veediots!, Attack on Titan, or even that one episode of Cow and Chicken. There is enough space to pair with another foreground too: you can add a food tileset, or get really weird by putting a grassland or Toad House in there... or even a fiery set like Hotspot in Kirby Milky Way Wishes to make a level themed around the lungs of a fire-breathing dragon instead of the obvious belly if you disregard the medical decorations. (Unless "it went down the wrong pipe!" Clearly a job for Dr. Mario.)
You know, I can actually also see this working for the inside of a tree with the right browns. Golden yellows for pinks, gradually shifting to tan and to sepia. With greens, even a flower stem, pitcher plant, or venus fly trap could be the whole stage. A Bug's Life, anyone?
This is the right "meat" set for inside your fauna AND flora!