Regardless of what your arguments are, the personal reasons of the developer are what matters for what platforms this game is provided on. You can choose to pay for the game, or not. Paying for the game supports the developer, and allows them to develop more. It is not reasonable to argue that someone should have put in additional unpaid effort to do something for unknown future benefit, or that they should charge less for a game because it's only available on one platform; that's their choice, and their decision.For context, development of Taiji was started in mid 2015; it took seven years to finish. That's with the Commercial Game Engine, and even with that, there were platform-based bugs that needed to be worked around (issues that won't be present on other platforms, or will have different presentations); here's just one of those, involving an issue around mouse sluggishness:https://taiji-game.com/2020/07/13/68-in-the-mountains-of-madness-win32-wrangling...If the developer is not already familiar with Linux, then there's a small mountain of language barriers around using Linux that needs to be overcome first, before being able to get to the game development phase. It's rare for game development to work on different platforms when it can't be tested on those different platforms. While it might be easy to cross-compile on a Windows system (e.g. via IL2CPP), that's only if everything works perfectly (which is unlikely to be the case). 

However after doing a bit of testing I see that this character is not used to represent missing glyphs on either my Windows 7 computer or the Android phone I've tested with (Motorola Atrix).

Different ways to prepend a line: (echo 'line to prepend';cat file)|sponge file sed -i '1iline to prepend' file # GNU sed -i '' $'1i\\\nline to prepend\n' file # BSD printf %s\\n 0a 'line to prepend' . w|ed -s file perl -pi -e 'print"line to prepend\n"if$.==1' file

Also cross-compatibility with mail clients can be hairy, so you should see what the industry experts are doing.

For Mac OS X, the syntax seems to be: