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Here are a few thoughts:
Maybe think about incorporating some more white space. I come from the school of thought that there’s literally never too much.
You’ve got a really clean interface and I like that. But I think the colors are a bit dark and confining. It doesn’t have that bright clean feel to it.
Along those same lines is the color scheme. I feel that the blue and the orange are both too dominant. I think it would be cool to do a nice mono color scheme with one accent color that is complimentary and used sparingly.
I like your typeface. I’m a big proponent of a nice clean sans. It’s nothing flashy… doesn’t have a whole lot of pop but it’s readable and clean.
My only other question would be… why is this mockup so narrow?
No need to change the mountains. The design does not appear to be a copy nor does it look like it at first glance. Just because they have mountains as backgrounds does not constitute a “ripoff” and I would bet my life that they were not the first to come up with that idea.