Not bad at all, pretty easy and short but it's still nice.
In my opinion the main things to change are:
- the skybox: try to find one that is complete, the one you used has a hole on the bottom face
- the transitions: the problem with hammer is that when you have rooms connected to each other and that every single room has skybox textures, you're going to witness a really awful glitch (see:
Example 1 Example 2 Example 3). There are 2 possibles ways to fix this. First, you can separate all the levels and put doors (teleports) at the beginning and end of all jumps. Otherwise, you can replace your skybox textures in your levels with playerclip and put a giant skybox around the entire map (just like jump_sexydev or jump_rnc) like this:
http://puu.sh/mm0nW/248a335583.png .
You have a lot of other things to fix but the map is still playable and enjoyable. Good job
