Glad you had fun playing it.
2500 points are really good, congrats! :D
Yes unfortunately this is a bug. I've now written down all known bugs so far on the game page.
There is one bug that I could think of:
The cursor normally attacks once per second, but the moment the player changes directions, the cursor resets its cooldown and clicks immediately, this also happens when the player runs along the walls.
It is possible to run away from the cursor normally, but its also possible and recommended to dash using the Spacebar. Unfortunately, there is no tutorial for the controls, but they are now written in the game page too.
Feel free to send the video, it would be much appreciated! :D