Splitgate, an arena shooter with portals, first jumped onto my radar when I stopped by the booth at PAX East just last month. My initial reaction was pure astonishment that nobody had done this yet. Surely someone started working on this concept after playing ten minutes of Portal back in 2007.
Whatever the reason that no other developer saw fit to make a game like this in the past 12 years (or at least not one successful enough for me to remember it), 1047 Games decided to combine portal hopping with competitive shooters. Everything about Splitgate is instantly appealing to me.
Source: Destructoid Splitgate: Arena Warfare has me thinking with portals