I get you want to give the option of background running but at least ask if we want it run in the background. Once I closed the program without clicking stop by mistake, and even after I tried closing the browser and opening it again it wouldn’t stop. I tried opening the program again and putting another key combination with a different interval but the first one wouldn’t stop. I tried to directly delete the program from my desktop but every time I right clicked it would open the options menu for a fraction of a second then close it and open another window for the program instead (which isn’t supposed to happen and is very suspicious). I tried deleting it from file explorer but I couldn’t search for the file since it would repeatedly keep pressing the key combination. I had to restart my computer to get it to stop. It would also for some reason mess with window preview when I would hover my mouse over my browser icon.
I liked the program’s simplistic format but at least let us put a decimal point and choose an interval because 0.5 is pretty slow in some cases and I might want to put an interval of 3.5 secs or 4.5 secs. If you are worried about it crashing by going below 0.5 secs then I think you should improve you program as I have seen many auto key pressers go to even 0.1 secs for more than five minutes and not have any side effects on the computer.