Still working on this game. Today I’ve added some new effects, new UI elements, music, a main menu, a pause button, and end game dialog. I also added support for touch (clicking/tapping the left or right half of the screen moves left or right), but it doesn’t make sense to use those controls on a PC.

It still needs some polish, but I think I’ll work on this for another week or two, get some feedback, and try to publish it.
UPDATE
And one final update before I finish for the weekend: Tunnel Racer v3a
I’m still toying with fonts, UI arrangement, and effects, but I’ve come pretty far and I think I’m close to having a final product.