I think he means use task managment, make sure nothing from this app is running on your pc. then restart your pc. then scan your computer again for any remanants of this app. it is possible this game is malware and messed up your computer but if it is just a glitch then what i said should work
WOAH!!! my favorite game on itch ever!!! Learning to beat master difficulty was soo satifying, can't wait to start challenging my friends, this game could get interesting