The cursor delay issue is a problem with the web version of itch.io. Apparently, in certain browsers, it lags more than expected. Today, I will upload an executable version to provide the complete experience. Thank you very much for the feedback!
Thank you for your feedback and for taking action to improve the user experience by providing an executable version of the game. I wanted to clarify that the issue might not be directly related to cursor lag. Instead, it appears that sometimes the Easter egg sprites are rendered above the cursor. Ideally, the cursor should always be displayed on top of all sprites, including these Easter eggs. This could be the root cause of what users are experiencing as cursor delay.