The game is Narbacular Drop. I tried using a GIF, and it crashed. It only supports BMP and DDS, I think.I could try others, but it probably will crash with those too.
Unfortunately, it’s an incomplete game, and since it was the final project of a group of college students, the college owns the rights and the developers can’t fix things, as much as they’d like too.
They did, however, get hired by Valve to make Portal.
I’ve been making custom maps, but I decided I wanted to make a Portal mod. I found an exporter for Blender that produces models the game will read, so I’m making a new set.
What I’m working on is the model of the actual portal, and I thought it’d be cool if it had a vortex thingy before you place it, at which point the actual portal texture would be on top of it so you can’t see it. I’ve got the model and I made a base texture, but now I want the vortex to swirl.
If I thought I could animate the face with the vortex on it so it rotates, I’d do it. But it’s kind of hard to take a single face and make it rotate AND retain a rectangular shape.