Cool map, reminds me of the stuff I made when I first got Cube.

It´s a nice map for a first one. What do you mean by small? This is about as big as a Cube map with that low amount of detail can get.
I like the church and maze, though there are some things that won´t make gameplay very pleasant. The stairs up to the gallery and the gallery itself are to narrow, won´t allow the player to strafe around much. The maze will cause confusion too, but I guess that´s what a maze is for. :)
I believe you get about 200+ frames in the jumppad corner? It´s not strong enough to get me up there with vsynced 100fps..
You could have thought about a more original filename, I already had a castle.cgz and it won´t be the only other castle.cgz, for sure.