I really like the proposed tree, especially the wall spell. I was always a big fan of those type of effects in D&D. In one of my favorite 2nd edition moments we were fighting a titan. Our paladin, who had 25 strength from magic items, I had cast enlarge on. I set up a Prismatic Wall behind the titan and the paladin body checked the titan through the wall. Knocking enemies through a wall multiple times with Repulsion Blast sounds like a blast (excuse the pun)

I'm not sure about the proposed Gravity changes. I'll have to play more with the tree but my preliminary tests had it feeling pretty tight aside from dealing with plants. The biggest issue I see with the Repulsion Field idea is that Repulsion Blast has a really low cooldown and a large knockback distance already. Knockback resistance is one of the best lines of defense players will have for dealing with this. Maybe I'm splitting hairs though. Singularity is something I've considered myself but it would either be to similar to Gravity Spike if it replaced Gravity Well or to similar to Gravity Well (a second map effect) if it replaced Gravity Spike. I've also heard the argument that it would be to much like Maelstrom and Irresistible Sun.
Spacetime Folding and Weaving do have a lot of overlap. I've considered trying to consolidate some of these effects but every time I've brought up cutting a talent someone has told me how much fun they have with the talent in question. Temporal Wake is probably at the top of my list as far as stuff that could go. The stun is nice but somewhat redundant with Warp status effects. Aside from that it's basically a Dimensional Step with a damage component, which again is redundant once you get Phase Pulse. Other candidates are Dimensional Anchor, Warp Mines, Banish, and Wormhole. Wormhole was one of the first things yufra helped me to code so I'm fairly partial to it. Warp Mines fits the ranger concept of Temporal Wardens well but not so much Paradox Mages. But I've gotten a lot of positive feedback on it. Dimensional Anchor and Banish have a lot of synergy but I'm not sure how well they stand on their own. Dimensional Anchor also has synergy with Warp Mines. Swap... well swapping enemies into their own bolts is just too much fun.
The actual Warp tree I think stands well enough alone and gave me hours of entertainment on my test character last night. Not to discourage your ideas, it's just stuff I've gone back and forth on a few times already.
I've thought about doing some wackier stuff such as your dinosaur idea. Robots, lasers, and power armor are other things I've thought about. But yeah, probably better for an add-on.