The gameplay itself was fun, but confusing. The sign next to the blue portal just repeated the controls to me, and I don't think I understood how the portal itself worked?
It seemed to teleport me the opposite way of where I was pointing my cursor, and then I got a massive jump boost for a few seconds.
The former effect caused me to fall outside the map, which I could reset by pressing "R", but that didn't seem to reset the enemies, so I couldn't retrieve the portal again, effectively soft-locking me.
The game's art style is very unique though, and I mean that in the best way possible. Together with the music and sounds, it seems just masterfully crafted.
Overall, great entry!