More signs would also be useful. It was easy to get lost. Another suggestion would be making it easier for people to differentiate between red's side and blu's side.
The only high ground is available to only scouts, demo's and sollies. You way want to change this to allow for height variation which helps keep gameplay interesting. You may want to remove the water from those platforms.
Finally just have some general player clipping. Use it on your doors, your stairs and your pipes to make traversing through your level as smooth as possible. The best way to check if you've player clip well is to see if you can run along your walls without getting caught on anything.
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