What's impressive about KILLOVER is how it is a game about the player screwing themselves over. This is a really hard thing to accomplish in a game randomness is often something that will immediately give the player something to blame when they lose. In this game, the only thing random is the spawn location and how your gun shoots, but even then, they were locations that the player spawned and ways that the player's gun shoots, meaning the blame cant fall on the game but relies solely on the the player remembering each loop enough to avoid their own mess. That combined with the tried and true difficult thing to add to a 3D game, aiming, makes for a truly challenging game of memory and accuracy that I'm sure has plenty of strategy that can be built off it.
One more thing though, I love the art style. It doesn't necessarily fit a niche that the game was going for, its just fun and different. Sometimes, that's all a game needs to stand out, but pair that with an amazing game design, and you've made a fantastic game!