I've been meaning to try this out and leave some feedback ever since our mutual friend shared your itch page with me. Sorry, it took so long!
I definitely get not having enough time to fully realize a game for jam. I tried entering a jam earlier this year and ended up not submitting because I severely underestimated what I needed to get done for it. Good work never the less!
Before this, I had never heard of MonoGame before. If you tried Unity, how does it compare? Unity is basically all I know myself (and by extension C#). I tried Godot for about a week before switching.
Oh, and in my own head canon for the game, I imagined that John was beating up clones of himself. So the John theme was complete John fighting Johns in the John. Looking forward to seeing what else you come up with when you find the time!