Existing tools like shc (a shell script compiler) wrap shell scripts in C code and convert them into binaries. Because of this, using kernel-level monitoring tools like auditd or bpftrace can easily expose the source code.
HimitsuShell embeds its own shell interpreter directly into the binary. It doesn't depend on the OS's /bin/sh or /bin/bash, so the source code isn't exposed as-is through kernel-level monitoring tools. It also applies obfuscation and anti-debugging techniques to raise the difficulty of reverse engineering.
It's up on GitHub, and you can also try it live at himitsushell.com I hope this helps other developers who are dealing with similar problems.