Thank you for the nice words! I spent loads of time on polishing each level's environment and giving the game a fitting theme song, so it's nice to hear you liked it!!
A quality menu is a good idea, and I'll add it when I get the chance!
Regarding the lag, try refreshing the page for the web build, sometimes it can be laggy on its first load. If that doesn't work, the Windows build is a good option too!