So here are my thoughts: For a $5 experience? Not bad! It feels much more like a demo than a completed version of a game though. To give you my main points:

What's great:
The rex looks fantastic and his size compared to the player is *chef's kiss* perfect!
The dialogue is cheesy but in that really sexy way that I love and I honestly like the voice acting, it's got a good vibe to it. I love that he calls you "meat" and says things like "may I eat  you?" but maybe that's just the vore fan in me talking.
All the gear looks great on him, especially the piercings.
I love that you included the foot animations, very hard to come by especially in VR and that's where we need it most and I like that there's the two separate versions. I wish he moved his foot a bit more in both but what's there is great!
In line with the last one I love that this was genuinely a game where some of the best angles were lying on my floor. It really was a neat experience a lot of VR games tend to shy away from and the angles looked really good.
The lighting, small thing to comment on I know but it's really good and immersive and VR devs struggle with good lighting like yours.
Even without the physical contact doing anything at least there's still a little game aspect but I definitely wish there was a little more to it, but hey $5 game.
The audio just overall is really solid.
I love the free movement, it is a huge benefit and I love that you can move without having to teleport around like some (nauseating) VR games.
The environment just looks good overall and the game from a to z didn't cause me any eyestrain except for the menu.
The inclusion of subtitles is appreciated.
I'm not one for watersports but the piss scene is legitimately hot, well done! 
I love that this is the ONE VR game I've played on the Quest that I didn't have to fight with to make it work. Every other game I've tried to run on it has been a headache but this one didn't fight me at all.

What needs some work:
I love the rex model overall but there is some REALLY bad stretching around the arms. If pits are kinda your thing like me it's really noticeable especially when he flexes, and it makes the model look lower quality than it really is and that's the only noticeable spot that has stretching issues.
It's a little buggy. Every once and a while it would randomly teleport me away from him whenever I got close. I thought it was to position for the scene but it was for all of them, even ones where you are supposed to be close but I found out turning off automatic positioning fixed that. Also the menu was really jumpy and hard to select things in,it was the only part that caused eye strain.
The police. I thought it was gonna add some quirky layer, maybe some extra kinky dialogue or maybe like a, hey we're gonna keep going while they're watching exhibitionist sort of thing, and I liked his dialogue when they showed up the first time or two, but overall it was just an annoyance. It happened constantly and kept interrupting the moment and I experimented with getting caught and all it did was end the scene and didn't do anything fun. It was overall really pointless and it got so annoying I just had  to turn it off very quickly. 
Once again the vore fan in me talking but I love the inclusion of the maw play scene, however this is another point where the model just isn't that refined. What you can see inside his mouth doesn't look very good, also the angle at which he holds it doesn't let you actually look in his mouth or down his throat so really you can't get much out of it. It's the only bad looking angle in any of the animations. I love the muffled dialogue too but I'd love to see some more verbal teasing from him there.
It would be nice to have some other scenes where he's fucking you besides just the riding one, like a tweak of the one where you're supposed to be fucking him just from underneath for example.

My biggest complaint was really noticeable in the feet scenes and blowjob scene but when you got to the position your face is supposed to be in for that action, his body closest to you disappears. It's not so bad in the blowjob part if you just kinda look up, but in the foot job scenes it was really disappointing. To get as close as one would have to be to lick like the animation, it makes his foot completely disappear from view, so you have to watch it quite a bit farther away than intended. I get that some of that is unavoidable of course but that needs to be tweaked as much as possible because otherwise it really ruins the immersion of those scenes and they're a couple of the best scenes in the game.

In summary this is the foundation of something really spectacular, I think you're really onto something here. I'm definitely not mad about it being a $5 experience. I do think it needs some polish though besides needing more content to really merit being a paid experience. It feels more like a tech demo, a "see what I can do" than a completed game, and that's okay, as long as you keep making more games or add more to this one! :D In the future I would either lean more into the 3d semi-interactive movie aspect or lean more into the game aspect.