. also usually the best technique is the one that requires the least effort and allows the hands and body to remain in the most natural tension free positions, what i've tried so far screams tension so again my way right now is 'incorrect'
Try using the palm of your hand, fingers pointed in the general direction of travel without touching the keys. You can angle your hand in such a manner that the palm touches both white and black keys. There is no need to obsess that every key is struck and that pitches progress in the orderly manner with which we associate a chromatic scale. Think: wipe the fog off the glass. I would agree with above posters that a black key glissando is very suitable in the context of the music. If you are finding it is getting in the way of forming sense of structure and interpretation of the whole piece, just place a generic glissando in its place for the moment. You can even omit the gliss pitches at that point while performing the physical gesture with your hand over the keys. As the rest of the piece forms it will give you ideas on how to better fit that glissando in.
also tips on where it ends i.e. what note it actually stops, does it even matter?
Aside from contemporary repertoire, the only piece that comes to mind that uses such a glissando is Debussy's Feux d'Artifice, but you use both hands for that. I would suggest RH2-3 palm down (i.e. not the backs of your fingers), 3 on the white keys and 2 on the black keys. Be sure not to strike a minor 2nd when you start it; play the first note in the glissando as a grace to the 2nd, and then slide. Also end on a single note. There is no way to tell where it should end; I think you'll just have to use your ears. This is not something that has a "proper technique," so don't worry about it.But the recording you posted is just a gliss on the black keys.Here is an example of a "chromatic glissando," as you call it:Skip to 2:55.I seriously doubt anyone is getting "called out" on the way they perform the glissando in that piece, despite what somebody said. There isn't a group of real pianists paying attention to those playing video game music.