Ah ok, that all makes sense. Gameplay-wise it'll likely come out way different than Mission Spaz was. I didn't read your review on that episode, but what you probably meant by 'vertical spaces' is the broad usage of going up through springs or one-ways followed up by an imediate 'falling down' part. More than in the original JJ1 levels where you go straight in one direction for longer distances. Basically, Mission Spaz has a lot of pits that are deep enought for the player not being able to see what's down there, not even by crouching. Thus it relies on trial & error with a strong taste of muscle memory. It also had annoyances on the horizontal space, with most notably the 'bats' on the 2nd planet that zip into the screen at high speed.

Besides that, I'm not complaining and joyfully played through Mission Spaz several times!