Rebuild 3: Gangs of Deadsville
1 day 16 hours
Man O' War: Corsair - Warhammer Naval Battles
Empyrion - Galactic Survival
9 days 3 hours
7 Days to Die
54 days 8 hours
State of Decay
23 days 5 hours
Crusader Kings II
19 days 2 hours
Mount & Blade: Warband
18 days 14 hours
Its far too colourful for that imo reminds me more of bioshock than system shock 2.
The game play, as described, is System Shock though.
A 20 year sentence is not gonna achieve anything though.
Definitely put them into prison for a few months, that'll scare them smart, but come on, if you put a 21-year old into prison for years for something like this, the only thing you'll get is a proper criminal when he gets out.
Or, if he can't be helped, throw him into a volcano.
Don't just lock him up with criminals though.