I actually enjoyed it for $25. It may not have been worth $50, but for $5? heck, the game was fairly innovative, and enjoyable. My personal cost-benefit ratio is about $5 per hour of enjoyable gameplay I expect to get out of it. Thus, things like this are no-brainers.
If nothing else, I considered it challenging to go through an entire game without really having much in the way of armaments.
Anyway, I’d give it a shot for that price if I were you.
Similarly, there are a number of old games I grabbed off of the holiday sale. Some of them I own/owned copies of already, but this links them up with Steam. I grabbed the XCOM games cheap. I don’t even think I could get my copy of UFO defense to work last time because it ran too fast on modern processors.