I have drawn multiple layers of background art to create a parallax scrolling effect. Currently I have a desert and dark forest, with maybe two or three more to come. Despite the simplicity, this art style for backgrounds can be a challenge to pull off.
Javelins are working too. They impale and get stuck in the ground or an enemy's body part. I tested all this on a Samsung Galaxy to ensure the animations are smooth and the controls feel solid.
I want to finish all the art this month, and then do all the programming in March.
Meanwhile I have been testing and fixing my traffic game before opening it up to others for beta testing. I found a good soundtrack from Pond5.com: my usual source for royalty-free music.