It should have choose your own adventure elements, where the path ahead splits into more, and you can only choose one. Different paths have different combat encounters, mechanics, and bosses. There are multiple endings, but only 2 where you survive. The first one is where you manage to land the ship safely, and everyone survives. The second is where the ship explodes, but you manage to get in an escape pod, becoming the sole survivor.
I dunno. This might be a little too difficult to make, and require a significant amount of time.