The color palettes aren't quite right, I saw that you weren't quite done with this. The ship shoots copies of itself, rather than lasers. Occasional the score numbers are mirrored. The hblank may be a little off, I noticed some odd colors on the right side of the screen. It might have just been my error in the things I changed for mister.
¿Exist a version of that pokey impementation for verilog o vhdl? Im using Xilinx ISE and dont support System Verilog, and the conversion of that module is a mess. I used in the past the pokey_atosm or asteroids_pokey, but dont worked with centiped.