Okay, I've played it a lot (a lot) more. Apart from being viciously, and incredibly difficult, it is an excellent work that has exceeded my expectations. I think it's because I don't play many FPS, but I haven't had this much fun with a game of this style in a long time. It's simple but its combos give it a lot of grace and dynamism, and its bizarre and spectacular art won me over (I love how the weakest enemies from far away look like goblins but up close they are cute green dogs).
I take this opportunity to say that I use a computer made more than 10 years ago. And the game, except for things like fire, works and works well, and with the 3D graphics it has is something that I appreciate a lot, Excellent optimization!
I'll play it from time to time to try to complete it, I can't get past the fourth span ahahaha.