Tron, titled Space Paranoids. It's your basic first-person tank simulator, in which player navigate a maze while fending off enemy tanks and Recognizers. So, in that respect, we guess it's not all that "basic."
It's really fun, but regardless of how adroit you become at tank-shooting, you'll never be able to beat the top score of 999,000 set by "FLN." Still, if you can be satisfied by aspirations for second place, Space Paranoids is definitely worth checking out.