The enemies were too fast and their hit-box too small for me to click on them. I could not last more than 10 seconds before they swarmed the center. And the custom cursor clicks on the middle instead of the tip, which is confusing. Changing those things would make it way more playable.
Then I tried to create portals, but it did not seem to work. Was it clicking, right clicking, dragging...?
And for moving the camera, only the arrows worked, not WASD. The initial position and size is good enough already to see the incoming enemies from a distance, but it was also a good option to make it possible to move it.
The graphics are pretty clean and easy to read, make me wish I could interact with all those objects.
The main menu is a little buggy, but I liked what you did with it, quite original. Adding another option to check again how to play would be useful.