Okay, so I am not playing on the patreon only version[just to get that out of the way], and I've noticed many places and items JUST out of reach of my normal jump. I have beaten the tar boss, and cleared every portion of map I can[even getting the secret health piece in the caves]. This includes the Blaster upgrade in the Base Camp above the door, and I was curious if there's something I'm missing somehow. Another item I can't seem to reach is in the cave room just next to the Base Camp, with the thorn vines on the ceiling and the side of a "ledge" that has a skill point on it.

If you're playing the public demo, then you're not missing anything - you've just reached the end of the demo. There should've been a screen saying as much after defeating the second boss. The collectibles you're unable to reach require upgrades you can't get in the public demo

Ah, alrighty then. Just frustrating cause it's there but impossible to actually get. I got that end of demo screen, but that was before I had finished exploring, so I wanted to know EXACTLY what I was missing.