It is an interesting setting and a decent core-mechanic (roll a d20 under a target score, which is an 'asset' (a skill plus attribute) doubled, halved or quartered and so on for difficulty). The combat system is crunchy but reasonably simple once you get used to it and just as importantly, have organized the information you need better. The character generation system and background are conceptually fine but woefully implemented, since the designers have not quite thought through how these systems interact with the core mechanic properly. The rules for interacting with environment and surviving are excellent, as is much of the system dealing with encounters and NPCs and so on, although the GM is left to deal with some quite important issues (ones of campaign design on the one hand and on how to run encounters with large numbers of combatants on the other) with insufficient guidance. Min-maxing is easy: so easy that I am unsure as to whether the authors designed it purposefully that way or not. The rules are quite badly organized and bloated too, given the central simplicity. There is a good game in there, but it will need some help to emerge. The character system is too hardwired to easily do much about though.

I have a longer and more detailed review here, along with a short playthrough: https://thewhirlwindofthemaelstrom.blogspot.com/2019/07/twilight-2000-second-edition.html