Grammar Check for a Sentence About a Snail Climbing Upside Down for a 5-Year-Old

Let's check the sentence:

"A snail can climb up a wall and even on the ceiling. upside down, imagine that"

There are some small mistakes:

• The second sentence "upside down, imagine that" should start with a capital letter because it starts a new sentence.
• It is better to join the idea to make it clearer, for example: "A snail can climb up a wall and even on the ceiling upside down. Imagine that!"
• You can also say: "Imagine that! A snail can climb up a wall and even hang upside down on the ceiling." This is easier to understand.

So, a corrected sentence could be:

"Imagine that! A snail can climb up a wall and even hang upside down on the ceiling."

This is clear and correct!