Tank minigame (wip) (Patreon)

This weekend I've started with the idea to re-create a tank game I remember playing when I was a child. But after adding the movement, shooting mechanism and it was time to add the enemies. I was running out of time and I decided to ask you for alternative ideas.
My lazy side is telling me some wall-e like junk destroying minigame with cute, cartoony graphics.
Please play the game and let me know if you have any good ideas.