I'm so glad you didn't experience any performance issues, I spent a lot of time optimizing things where I could, specifically building an object pooling system for all the blood and gore effects as well as the consumables. Also, I did have a Fullscreen toggle in the games options, but I also added one to the itch page directly now just to make it a little easier, good suggestion!
Thanks a lot for playing my game and I'm really glad you enjoyed it!