App crashes on exit

Note that your try/catch in Static_Update will swallow Errors, until at some point the app crashes. If I change the code to:

    static extern (C) void Static_Update() nothrow
    {
        try
        {
            if (instance is null)
                assert(0);

            instance.Update();
        }
        catch (Exception ex)
        {
            assert(0);
        }
    }

Then I get a nice stack trace without having to run it in the debugger:

0x000000013F2CD2D6 in onAssertError
0x000000013F2BB5E8 in d_assertm
0x000000013F164EBA in void db.game.__assert(int)
0x000000013F1643EB in db.game.Game.Static_Update at C:\dev\projects\feedback\src\db\game.d(291)
0x000000013F1A2EF8 in MFSystem_RunFrame at c:\dev\projects\fuji\fuji\source\mfsystem.cpp(402)
0x000000013F1A2DE9 in MFSystem_GameLoop at c:\dev\projects\fuji\fuji\source\mfsystem.cpp(364)
0x000000013F19145A in MFMain at c:\dev\projects\fuji\fuji\source\mfmain.cpp(59)
0x000000013F165113 in db.main.Start at C:\dev\projects\feedback\src\db\main.d(96)
0x000000013F164FCA in db.main.WinMain at C:\dev\projects\feedback\src\db\main.d(32)
0x000000013F28C684 in __tmainCRTStartup at f:\dd\vctools\crt_bld\self_64_amd64\crt\src\crt0.c(275)
0x0000000077A2F56D in BaseThreadInitThunk
0x0000000077B63281 in RtlUserThreadStart

[TurkeyMan]

You reckon I should treat all exceptions as non-recoverable?
I guess it makes sense...