GabberFly has the fundamentals of 1.9 design down quite well in all regards. I appreciate that each part individually has its own defined structuring style, as it gives each part a much stronger identity and keeps the level as a whole feeling varied. For example, the 45 degree sloped structures in the UFO around midway through are a visual standout as this kind of structure was not as popular back in 1.9, but also serves to create some fairly interesting gameplay as the slopes nearly match the natural gravity of the UFO gameplay, placed at odd positions and using gravity portals to add a memorisation element without the need for fakes or invisible gameplay.

Most of the block designs follow the same general template, with a darker "outline" of one type of block (generally brick, flower or metal blocks), and a lighter inner section that tends to pulse more strongly and contain more detail. This template on its own is quite solid, and the contrast it creates between the two main design layers is very nice, but I would have liked to see more variation on it throughout the level. Mixing the outline colours with the inner section, swapping designs, or even having everything on one design might have helped certain parts stand out more - namely the wave-cube dual at 0:35 where the colouring across all of the elements is similar enough that the contrast factor is minimised, leaving the designs as a whole quite messy. Aside from this, though, the level is solid in most aspects, and I'm quite surprised this was never rated. Nowadays I would recommend it for Star Rate.