Firstly, mazes primarily made for speed runs are better using curved surfaces rather than straight edges.

Secondly, little surprises like some switches closing off gold are not a good idea.

Thirdly, even speed maps should have some challenge as far as enemies go, even if you have to throw gausses in the corridors.

Fourth, don't put gold on switch tiles.

Fifth, don't put so much gold period, sprinkle it around :p

You forgot one more word.

One!

No fun at all.