Simply use an orthographic camera and rotate it. This question has been asked an answered dozens of times, in much more detail ([there's even tutorials!](https://www.google.com/search?q=Set+up+Camera+for+2D+Platformer&aq=f&oq=Set+up+Camera+for+2D+Platformer&aqs=chrome.0.57&sourceid=chrome&ie=UTF-8#hl=en&safe=off&sclient=psy-ab&q=orthographic+camera+for+2D+Platformer&oq=orthographic+camera+for+2D+Platformer&gs_l=serp.3...5524.12728.0.12956.36.27.9.0.0.1.149.1605.26j1.27.0.les%3B..0.0...1c.1.6.psy-ab.p4dyKrSTPtk&pbx=1&bav=on.2,or.r_cp.r_qf.&bvm=bv.43828540,d.dmg&fp=c88c58e01e24d8b1&biw=1280&bih=939)). Please bother doing a Google search or searching UA before posting.
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