Itīs a great exercise, Victoria!
On the exercise where you must put the verbs in the past simple, I would just change some of the sentences, so that all of them have to do with the song (I think it would be better :)). (Itīs JUST a suggestion!)
You have lots of creativity. Your students are very lucky!!!
Congratulations on this fabulous piece of work! The song is really nice, I didnīt know it ;)