Thanks again for your suggestion.
You can try out an initial build for Pinkie Rabbit Land here.
I've taken the liberty to add some G&W style features like the time, alarm and ACL functions.
I've implemented the gameplay based on the link to the video you provided. I probably need a longer video to figure out the difficulty progression, but for now (just for testing purposes) the maximum number of enemies on screen increases when the score reaches 20, 60 and 100 points. The speed also increases as the score increases.