Had to switch browsers, Edge couldn't handle it, probably too many effects, and it kind of gets cut off in the page window forcing you to go fullscreen. But the game is fun and really cute, congrats!
It might be issue from your side, I tried in my i3 7gen intel 620 and it worked smoothly...smoother then my daily driver browser.....So i think its issue from your side...if its persists try running game on some other browser