I think the choices are impactful for sure!
You're referring more towards the path that you can take versus the choices themselves. Because it's a demo, the path is definitely more guided -- or rather set -- on the completed parts, and the Dev definitely stops you from deviating off that path for the time being. I ran into the same roadblocks of "this isn't available in the demo"; however, the pathway that you CAN play definitely has some relatively intense choice value! I don't want to spoil it, but there are two different times where a lack of response (literally selecting nothing) will put you on a different subpath.
So yeah, to me at least, it's pretty choice heavy, and I assume that it'll only get more intense as the game reaches completion. Since then, I did play a significantly MORE choice heavy game, but I'd still list this one as a choice-heavy game, just not as high up on the list as it originally was
Definitely give it another try in the upcoming days though! I thought it was rather good, especially one subpath in particular ;)