I had plans to create a undo button, but due to the involvement of too many objects and my poor programming skills, I couldn't make it.(TOO MANY BUGS!)I'll add an undo button in the next update.
I have tried using the character that has its directions reversed to create levels before, but I thought the experience was not very good, so I only created one tutorial level. {{{(>_<)}}}
And thank you for your valuable feedback!!! (´▽`ʃ♡ƪ)