Hey, some pretty cool effects! If you're still developing it, I spose I'll give some more critical analysis. Like others say, the camera is actively fighting you, and needs to better focus on the player. I'd also like to see more use ofthe 'other side', cos even tho the idea is cool, this demo fails to explore the mechanic in any interesting way. It'd be cool if you had to actually move fast to avoid overheating the other side. Also, the delays on collecting stuff wasn't a huge problem but felt kinda weird being delayed. Maybe if there was an actual threat that made the time taken collecting stuff tense?
Anyways, neat foundation for a demo, and I really love that screen distortion effect when transitioning between dimensions. I must ask, how did you do this? Did you literally distort the mesh, or was this some shader magic? I see this is a Unity game, so did you use shadergraph or somethin?