Great work. Really smooth satisfying movement and a big play area. I enjoyed the "OLC screen" easter egg :)
If you are thinking of doing more with this, I would love to heard some sfx, and see some particles etc. It would also be great not to immediately regen the enemies when you exit a screen - there were a few times where the exit was effectively one-way, as the enemies hit you too quickly on returning to the previous screen.
Well done