Played this for a few hours! The game is running perfectly without technicall issues and is very much like the original game in terms of functionality. There are minor changes to unit behavior (did helicopters always fire depth mines?), but the biggest change is indeed in the difficulty.
As it is, the game is aimed at mostly hardcore players who enjoy greater difficulty and challenge. Unfortunately too hardcore for me, but it's been nice to have this around again. Would absolutely love a difficulty setting that casual players could use to turn down the heat a little and have some fun too.
Overall, big kudos for the great reimplementation and thanks for bringing this gem back to life :3