I am using debian sid with the FOSS amd drivers (radeon) on an r9 390, i can load and open the game fine, but the first issue i get is that there are not icons loading, the game is really dark, so dark that i can not get past the tutorial, i think the shaders don't load because i see black squares instead of a character when looking from below it.
did anyone experience similar issues or have an idea how to fix it?

here's the output of lshw -C video:
*-display
description: VGA compatible controller
product: Hawaii PRO [Radeon R9 290/390]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 80
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:30 memory:c0000000-cfffffff memory:d0000000-d07fffff ioport:e000(size=256) memory:fe900000-fe93ffff memory:c0000-dffff



additional info:
GL_RENDERER = Gallium 0.4 on AMD HAWAII (DRM 2.48.0 / 4.9.0-3-amd64, LLVM 3.9.1)
GL_VERSION = 3.0 Mesa 13.0.6
GL_VENDOR = X.Org