Don't worry about how high quality the 3d models and textures are, often times there is definitely room to cut down on the sizes without it looking bad. For reference, something like Mario Odyssey has extremely high quality models and textures, but the game is only 5-6 gigs in size despite being many many hours longer than what you made. A lot of that you have to learn about still, of course, but do try to be mindful of how much strain you're putting on a player's computer.
The camera would jitter while climbing and it wouldn't always put me on the rock I was climbing on, so I would fall down after the animation played (that's exactly how I got stuck in a rock, actually)
Ah! That makes sense, I was pressing it but it didn't feel like it was making me sprint for whatever reason. Might just be a gamefeel thing rather than a mechanical thing at that point.