I am writing a tournament module set in a wizard's tower to run at a couple local conventions and wanted to ask if anyone has any general suggestions and tips.

It's an introductory adventure for 3-5 characters of level 1 using a custom rules set that will be familiar to OSR gamers and is also meant to be a teaching tool about the basics of role-playing.

I've already sketched out the levels and run it for my tabletop group (it took them only a few minutes to guess the eventual twist ).   The module has IMHO a nice mix of encounters (more than half of the levels can be solved without combat)- I always try to encourage outside the box thinking.  I didn't have any problems filling a 4 hour slot, and I have ideas on how to add or subtract as necessary.

I know I need to keep fleshing out the levels (e.g., adding treasure (which I hand waved during the playtest)), write up more pre-gens and add a victory point mechanic (a new player, for whom this was their first RPG experience ever and who was playing the fighter, got cold feet and fled before the final encounter ).  

Any other general advice would be great!

Many thanks in advance!