Hello, I am the author of this game program. I can quite assure you that this game was playtested three times to completion. What you describe sounds like an emulator issue.
Contact me privately at @hitfan2000 and I'll get you set up with an older version of Winvice (2.2) which should be far more stable. I'll set it so that true drive emulation is turned off and the game will actually run much faster.