Thanks for the feedback, my friend. By my stupidity, I did not indicate in any way that it is possible to be healed with the F key. I am very sorry if it somehow ruined the impression. But once again, thank you so much!
you mentioned the f key healing on the games page so i knew about it. It's probably me not being the best player. Anyway, better a challanging game than a boring one so all is good here.