Stijn: Agreed. If I return to it, I'll probably downplay warps in favour of more tubes, since that was the initial idea.
The samey look is mostly a result of the level still being unfinished; I planned on giving it a more varied look when some more levels were done(Perhaps even using a script to swap out the teleport sprite to make it look like Jazz is walking through doors, rather than teleporting through them). Basically, I really wanted to start work on level 2(Never did), which was going to involve tube junctions with switches to change directions. Kind of like the tram level of Half-Life, except faster and with more action between puzzles.

Cooba: Interesting.

SNZ: Wow.