This is Cube. The Robot Chapter is actually a bit suspenseful a times. It makes me feel like I'm watching the movie Alien because everyone dies one by one by some mysterious being roaming the ship. This chapter also has the best quotes. Just look at the screen shots below to get a taste of some of them, lol. :P The only battle you fight is the last battle. However, you can play Captain Square anytime you want (it's a game within the game). The Captain Square theme song is quite catchy, don't be surprised if you catch yourself humming it while driving.
The Robot Chapter is also pretty similar to an 80s anime movie called Lily CAT. If you want to see it, I have it available via streaming & download in my Anime Video Archive.
(click shots to enlarge)