As a workaround, you can launch the game from the itch app by replacing the runner with a bash script that runs the actual runner prefaced with the environment variable.
Rename the actual runner to something else:
mv ~/.config/itch/apps/bitrat/bit_rat_singularity/runner ~/.config/itch/apps/bitrat/bit_rat_singularity/runner.bin
Create a script at ~/.config/itch/apps/bitrat/bit_rat_singularity/runner that runs the renamed runner prefaced with the environment variable:
#!/bin/bash LD_LIBRARY_PATH=~/.steam/bin32/steam-runtime/lib/i386-linux-gnu ~/.config/itch/apps/bitrat/bit_rat_singularity/runner.bin
Make the script executable:
chmod +x ~/.config/itch/apps/bitrat/bit_rat_singularity/runner
Launching the game from the itch app will now use the environment variable.
-nick / [bucket drum games]