I have added a PAL version. The colors should be the same in both versions (even if the palette is different) and the speed of destroyer and submarines should be the same in both. Only the charges for now are moving quicker on NTSC version.
Just as a note, I have added also PAL60. In case you have a physical PAL device please test this as well just to see if it works (PAL60 is essentially NTSC with PAL colors but it should work on regular PAL devices - I have only a physical NTSC device for my tests). Thanks.
Great - the PAL60 version is the best solution for PAL users (almost all TVs will handle this). Yes, I play with real Atari (light 6er) via Harmony cartridge on a nice B&O MX4000 CRT and will let you know!