I found the experience funny and fast-paced! There were no choices until the final one, so it was easy to click through as if flipping pages in a novel. It also felt appropriate for the theme, since many 3D platformers have linear narratives. The detailed worldbuilding and the humorous voice of the narrator kept it from becoming boring, and I didn't really find myself wishing for more choices, although they could enhance the experience.
I got the ending where I discovered a secret room and a bonus positron. Afterwards it was easy to skim through and quickly reach the final choice, so I saw the other ending as well. For both, I felt they ended a bit quickly and lacked the same detailed descriptions in the rest of the game; for example, what does the positron look like, or what does it do? How does Smiley feel about finally getting what she wanted? I also felt like the secret positron was a surprise that came out of nowhere, and it was unclear if obtaining it completed the level or gave any other benefits.