Before you go and close this as a duplicate, I'm posting this as a new feature request because a lot has changed since the last time this was requested. There are now no technical changes necessary anymore to increase the tag length in a certain range. And there is a precedent now on Literature.SE for an increase in tag length.
The arguments for allowing longer tags have been noted in the older feature request Increase tag length limit to 30 characters. In short, almost all our tags are games, and games often have names longer than 25 characters.
The hard limit is now 35 characters, on Literature 32 characters were chosen. If anyone can find some examples where 35 would be a significant improvement over 32 I'd go with 35. Otherwise I think 32 would be a very noticeable improvement over the status quo already, and we could try that first.