Hey, don't mention it ... and as expected now with Mono support it runs smoothly!
I know using IL2CPP has the advantage of lowering compile time but, just for info, it seems that IL2CPP support, at least for now, relays, on Linux, on a few supported sysroot, the location of system headers and libraries used by your project for compilation and execution, so that if your C++ libs have a different path than mine ones or than other different Linux systems, unless those alternative locations are already taken in to account by Unity Engine, your game can't run on other Linux client systems.
Thanks, and keep up the good work!