Seriously, it's bloody fun!
It's incredebly good for a FPS on a Nokia! And even if it doesn't looks easy to play, it become really easy to understand the controls.
The shooting really felt like the first Doom, it's polished, there is this surprise of enemies incoming, it's great. Even more, it's very very good!
If you like Doom, you should definitly play this game
(and now I need my daily dose of Doom 2016)