Hi SH,
First of all, I'm really happy ( and envious) for you , that you manage to rope in other musicians - and engineer to record your composition.
I think if there are more changes in the tempo , this piece would sustain interest better. The continuous 'pounding' of the rhythm gtr is a little too much for me to take. For a piece this long, I think there should be more solo - perhaps also showcasing the other instruments . Now that you are playing along with other musicians, it is a chance to expand the composition with the other instruments. Anyway, you know me, always a sucker for solos :)
Can't wait to hear the result of your collaborations with the top notch musicians!
Cheers and enjoy the process !
RGX312L