Code Injection + Debug protection

I have a exe file that i want it protected from injection. To do that i created another exe that monitors the main exe, but the problem is some ppl using the app (its a online game) found the security exe and they kill it so the main exe isnt protected anymore. What is needed: TO inject in the memory cave of the main exe a code that will verify every second or so if the security exe is still running, and if its not to exit, or to run it again (ill leave to the programmer choice) The 2nd request is to make some kind of protection, so if someone is using ollydbg or ida, to not be able to find/debug the injected code, or mask it/ obfuscate it. The exes will be provided after the winner is selected.