I think its great to have at least one option for an ERP Next “skin” 
I like the layout. With colors, I think this comes down to personal preference, personally I am not a fan of the purple and teal on your theme. Having said that I have never used Odoo before.
ERP Next does have a “color” data type so as a suggestion you could fix the layout and the secondary color but allow users to choose their own primary / action color. Not sure how you’d do this though
One thing I don’t like in terms of the appearance of the default ERP Next is the way input boxes appear greyed out in ERP Next, which gives the initial impression they are disabled. I wrote a little CSS to fix this, Fields appear greyed out. I think this is by design? How to change - #4 by chrislennon