So, this was a high-effort game to try out for me, first to install DOSBox and then to finish a playthrough. But I did it.😄 I'm not familiar with the original, but this seems like a high-effort remake. There's a fair bit of stuff going on and the simulation is very detailed and, for what the 1971 tech style permits, atmospheric. Nice work!
Funnily enough, the first game I ever made from scratch was also a DOS game written in Pascal. It is easily blown out of the water by this one though.