"Transformation Complete" - Cinematic Incomplete Work

Ok guys. I need your ears! I am still working on this and I would appreciate feedback!  I plan on adding more vocals, lower (men vocals) perhaps... And easing off of the high notes...?  To be honest, the ending (which isn't the planned ending and I'm hoping it will gravitate toward a bit of a theme) isn't right, and is almost a bit annoying but I can't tell why...

The story I envisioned: A mad scientist in a haunting scene as he is injecting himself with his own formula and becomes the monstrous antagonist. The hero discovers the plot and is too late as the antagonist demonstrates his strength (hence the key change).  Basically, I want to audibly illustrate a 'twist' in a science fiction scene.

BTW. I am fine with blunt responses. If you don't like it, or have criticisms, please...  I don't get offended easily.  Also would appreciate feedback on the quality of the overall audio. I just purchased Cubase 10 Pro and already notice a difference, but I am VERY new to the program, so I am still learning how to space out instruments accordingly and how to even use the instruments.

https://soundcloud.com/karisalclark/transformation-complete/s-0IP3EmwdNYf

This sounds all right to me! I wonder, though, if at that key change you could be a little more drastic... what about adding a dark electric pad or something, increasing the tempo, throwing in some sixteenth notes or triplets...? You can keep the same ostinato rhythm—which I liked a lot, by the way—and simply add some more dynamism to it.

Just my $0.02.

Your ostinati/melodies clash via parallel dissonance and because they're so prominent it takes away from the harmonic aspect of the voice leading.