Thanks for playing the game!
1. Can you please elaborate a bit more on this point? You can scroll up or down in a game run to move camera partially. You move all the way only if you click MMB. By any chance are you playing on a trackpad? Asking as i still have to figure out from previous feedbacks trackpad stuff and I have not had access to a laptop yet to test it myself
2. Its a lot, unfortunately profiling this for a web build is almost impossible, at least from what i have yet found out. Its wasm build of love2d. But its WIP in general for to get it better optimized for desktop as well and hopefully that translates into web as well