Alright, here's my analysis:
1. The title is cut off when selecting the level. This may just be a bug in the game, but you should work around it for the time being.
2. Cool idea with the ladders.
3. Unfortunately one-block-thick walls tend to look really bad around the edges in VVVVVV. You should probably thicken them up.
4. The story is actually really great so far. Good idea with the telephones, as until there's a command for making crewmates talk this will be the closest thing to it.
Unfortunately there's not much more I can say at the moment, as the level seems to end as soon as I get off of the ship. This level has great potential, and I'm looking forward to seeing it completed!