I'm not sure why people still call this a doom clone when it has boring enemies and the back half forces you to slow down a lot (I love mines). There's lots of other little things that differentiate it, like various items that rely on a gauge, mission-based levels with briefings, exiting missions when the mission is complete with the main menu, a lot more effort into a story and cutscenes, a lives system, pretty different weapons, and more things I'm probably forgetting. 

It was alright for a few hours, and I really liked some of the levels. I should just stop trying to play Star Wars games when I don't care to watch anything about them.