I can explain why I am correct very easily.

When you say a game is too short you are not actually accurately describing the game at all. To get a metaphor to make it easier to understand: saying a game is too short is in the same vein as saying a game as too few dinosaurs.

When you are using an adverb like "too" to describe a degree, it means that the amount or value exceeds the amount that is necessary or useful for a certain application which varies depending on the context.

When you are saying these things the way to determine what you are describing is to look at the infinitive. Since neither of these statements have an infinitive there is no way to know 100% sure what the person typing them is trying to describe. However we can use common sense to think of a couple of possibilities. Here are some possibilities which I'll order from least likely to most likely.

• The game is too short for it to be considered a video game. Which is plain false because there is no necessary degree of length for a game to be considered a game, so they probably didn't mean that.
• The game is too short to be worth $5. This is an accurate statement, however it's unlikely the poster meant to describe this because they also said they felt like they got their money's worth.
• The game is too short to be enjoyable to me. Now we have an infinitive which is actually likely to be intended by the poster. However with this infinitive you are not describing the length of the game, you are describing your enjoyment of the game.

The mistake that was made was that someone is saying they enjoyed the game, but are also saying the game was too short, with the most reasonable subject being it being too short to be enjoyable by them. This is a contradiction.