I do have plans to add more to the interface in regards to fire rate and damage. Will also be improving the speed of ship and scrolling. For the nebulae, I was running out of time and rushed myself on those., I probably should have just left them out until I could make them look better, but at the same time I didn't want to leave the background to just parallaxing stars.
Thanks for playing and for the excellent feedback. I'm glad you enjoyed it. Also I want to buy your tileset for Fission lol!