Actually quite fun! You should fix the endless walking during completing several levels and the player should die when he fall. Other than that, this is a good game. Work more on it later (like more levels and features) and keep on improving!

This is actually quite fun ! The puzzle system is simple and effective, it makes for nice puzzles and platforming.

Here's a few things that I think would improve the game :
 - In the first level, shooting will kill you because you destroy the portal that's positioned properly. Maybe you want to deactivate the portal inputs until a few levels later when you explain it.

- Show which portal you currently have selected

- Deactivating the portals when it's invalid instead of killing the player would make things more clear.

Great job on the game, I enjoyed it !

Cool idea, and I liked the portal mechanic too.