Easy and fany!! Well done 

Pretty cool idea! I like the difference with the portals to have some unique level designs over the other "2 players copy movement" games. The first few levels were very well done, having me think about them to complete them! Although, some of the later levels I mostly found myself random getting the solution out of nowhere without influencing it.

Having some art assets makes a huge difference in the presentation of the game, but with a limited time and limited resources, just having templates works for a jam.

Some quality of life like undos would help, since I always was very worried about hitting an X and losing a lot of progress. 

With the addition of a few more mechanics, maybe one way portals or buttons to open up different routes, this could very well be a nice little puzzle game. Great work!