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The first thing you should do to improve this map visually is to add lighting. The lack of lighting makes it harder to distinguish from the ground and platforms, especially considering that they are similar in colour. Additionally, maps without lighting tend to be ugly to look at even if it is easy to distinguish between the blocks and the ground. I would also focus on creating more interesting structures and using more fitting textures (I am not quite sure about the combination of the concrete/pillars and ice textures).
In terms of gameplay, there is little challenge and records would likely be a a strafe competition (which you appear to be aware of). There is already an abundance of these maps and deviating from this is a good way to stand out. Even to create more interesting strafe maps try to at least vary height and add some form of interesting gameplay (different routes, boosters, etc), and increase length.
Overall, this map is not very interesting and could do with more effort on your behalf. Don't let this discourage you, but instead try to create something better next time.