I was initially put off this game by a description of it being a rogue like; it isn’t that at all, but it is an FPS with procedurally generated levels and weapons. Just clear about 80 of them and you’re done!

Loads of weapon variety, with the later level 3 weapons being completely ridiculous and a lot of fun. Maybe not the most technically proficient in terms of design, and it made my 3900X processor suffer later on, but it’s so easy to get caught up in the blasting as the enemies and gunfire increase.