There is an app called Ixerm for roku. It’s a private app and has to be added to your roku account manually with a phone or pc via Ixerm. It’s a very basic app, but it will let you search games, watch streams live with good quality.
Go to https://my.roku.com/add/KDNVTVD to add it to your Roku device.
There is another app that is currently being built by the author at TTVstream.com, it offers a superior viewing experience but because it is in beta you will have to put your Roku in Developer mode. He has the source code and install instructions on his Github page.