GG!
Thank you for your tasteful project! I suppose that we are playing on bird’s eye view because of terrain. Polytopia for ios can be good example as isometric birdview. It is flat design but if style on your mind is different, we can talk about this and more. Please feel free to contact me, also you can check my portfolio link below.
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What i know for your project: Graphic design, creative communication, vector & pixel design, color language, layout, sketch, adobe - photoshop, illustrator, ps sketch, ai draw - and more…
Best Regards…