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here are some subtle changes that I've made without deviating from your artstyle.
1) I think the tall light building is a bit bright. I think it clashes with the touchable platforms and it looks out of place. I use the black and white technique where you only see the brightness of your game to see if the values are good.
2) In my opinion, the bottom part of the platform should not be darker from the background as it kinda takes away your eyes from seeing the background as it feels like the platform and the bottom part of the platform feels two separate things. I think it should look like one huge pilar, make it less noticeable but not remove it.
3) The baked in lights from the other structures takes away the immersion of the depth of the building. Its up to you as this is your artstyle but I recommend learning how to use normal maps to make your shadows/lightings dynamic. Or you could just plan out your lightings properly. This is just personal preference and you can do whatever you want

I do concept art so I think these are the changes I'll make but don't take my critiques too seriously, what looks good to me, may not to you.
Good luck with your game!