It's more important to align textures when building on a square grid. When you see what I mean, it will make your eyes bleed.
It felt that the level is really sub-par because you set your sights low. For me, I wasn't shooting for a Zone 1 Act 1 zone when I made Nuclear Sunset, I was shooting for making a characteristic level that was fun to play and was memorable. This level is not memorable or unique, which makes it inferior to almost every single other level ever. I will officially be offended if you make this the first level in your pack. We need different content around here, not the same-ol'-same-ol'.
Although hey, I think I'm forgetting the purpose of this. If you want to practce 2D mode in DB, that's cool. I personally am a stickler for 2D mode, but I make up for it by testplaying whenever I want to see how my level feels. 3D mode is kinda a merge between the two, so I think it's entirely reasonable to use it a lot.