The best game out of the pre-Steam 2000's PC indie freeware scene, Iji was ambitious as hell and so ahead of its time. Hell, a major reason why I backed the Kickstarter for Undertale in the first place was because it strongly reminded me of Iji. (Playing Iji was also why Spec Ops: The Line did nothing for me at the time of the latter's hype cycle) A side-scrolling level-based immersive sim is still a rarity nowadays and Iji did such a skillful job of it, especially because it was just one guy designing it all. The game gives you several gameplay styles like hacking, heavy weapons, defensive weapons like reflectors, melee, or just simply running past all the enemies because Iji got them nanomachines, son. There are some hiccups here and there, like in order to go pacifist you have to do some pretty awkwardly gamey solutions outside of just choosing to not kill people like in Undertale, but its easily forgivable because of how much it gets right otherwise and how there weren't that many games doing what it was trying to do back then. The soundtrack is a classic too and the writing is pretty solid. Just overall an amazing package done by one guy and and an unsung classic of the indie PC scene.