Thank you for your insights :) Did you, by any chance, play the demo with a wireless keyboard or something?
I interpret what you said to be the inputs that are lagging behind a bit, and I know certain wireless keyboard connections introduce an unplayable amount of lag for whatever reason (keep in mind, it's a native Game Boy Color game and best played on a device that can play GBC games).
The controls should feel absolute immediate and 100% controllable, as I designed them to be very snappy and precise.
In any way, I'm sorry you had a subpar with the demo of my game! But thank you so much for taking your time to play the demo and also report what issues you had with it. Highly appreciated!