The game works and seems rather polished. I hear the work in the sound design which tries to create tension. However, the "fail" sound is far more prominent than the "success" sound.
From the game design perspective, it is a combination of Battleship, Minesweeper and Word Guesser, with weights on letter frequency. This may be solid but has a random factor which makes the learning effect unsteady. I was able to solve more passes with time, but success does not equal fun here. In comparison, the hacking minigame of Cyberpunk 2077 relies much less on randomness but on "seeing the paths to the right combinations" (logic). So it conveys the feeling of hacking more, and it was more fun (to me, at least). The hint "Avoid alert nodes" seems rather useless when the player clicks mostly by chance (unless he uses one of the rare Probes or has found a black field before) and can run on a "mine" at any time.
A letter game is clearly retro for me, and to breach a terminal is very cyberpunk: well done. But is it noir? Sorry that I don't see the noir aspect very much in it, too. It would work in any standard cyberpunk as well.
You described it as an element of an upcoming bigger game. Use the opportunity to tell more about it. ;-)