What doy you mean the mouse movement is janky? It's perfectly aligned to your mouse, and is a pretty good control scheme, but did you manage to have any bugs with it?
The trail is bugged has been a known problem that is just due to a weird web build, but there shouldn't really be a story in a game like this.
The high score should also be incredibly difficult the longer that people go, just some people are naturally good enough to avoid the theoretical greater difficulty of later in the game, so I may need to adjust the curve slightly.
Glad you still liked it, hopefully it was still fun for you even without these issues, might I ask what score you got though?