Nice work!
I would consider listing the "X to make a portal" control in a somewhat more clear spot, like the top of your game description or within the game itself (maybe along that blue strip at the bottom). It just took me a bit to realize that was a game mechanic.
I liked the large blurry trees in the backround, and the way you had them move - it was kinda mesmerizing when I looked at them!
And I like that you made an infinite runner! I was expecting to see more of those, but yours is the first I've seen. Good job.