Atrium - 3D game written in D

[NVolcz via Digitalmars-d-announce]

On Friday, 6 November 2015 at 09:04:05 UTC, Timur Gafarov wrote:
> Atrium (code name) is a work-in-progress science fiction game 
> with physics based puzzles (gravity effects, force fields, etc) 
> akin to Portal or Inverto. The game is fully written in D, it 
> uses custom graphics engine based on OpenGL and SDL. Physics 
> engine is also written from scratch.
>
> Source code:
> https://github.com/gecko0307/atrium
>
> IndieDB page:
> http://www.indiedb.com/games/atrium
>
> A precompiled demo for Windows:
> https://www.dropbox.com/s/qh8gai2n94qe8jj/atrium-testbuild-051115.zip?dl=0

Very cool!
How have it been to work with the GC?
Reddit it! Maybe with an writeup?