So I think I might know the reason for the lag. So in this game, I used pygame and pygbag to export the game to the web and I had some issues with lag when I had the resolution on 1200x900 so I changed it to 800x600 and there was no lag. What is the resolution of your device because I think that can make a difference. If you want I can add a downloadable version that might work better but I would have to do it 4 hours before the deadline. PS I am using a 1440p monitor and it runs smooth