I used Ludum Dare 25 as an opportunity to learn Inform 7, a language for writing Text Adventures. I succeeded at that, if not at actually writing a winnable game in it. But look at it this way: When does the villain ever win? So it's just fine.

The most important commands are (some of these may qualify as spoilers?) look, go x (or just s/n/e/w), enter x, think, take x, inventory (or just i), switch x, live, attack x, burn x.