It's a nice beginning but is still pretty rough
I would suggest the following for improvement:
- Slow things down a little, to give player a little time to adjust
- Have the bullets fired come from the center of the ball, right now they seem to be coming from the side
- Some marking on the ball to tell which side is the front so you know where your bullets are going to shoot
- Even a small difference in graphics can make a huge difference when you're starting out. I highly recommend Inkscape, you can use do a simple gradient tutorial and put up some stuff that feels way better
Good luck!