First person endless runner. Nice concept for a game, could use some polish though.

Frustrations:
Movement (left to right and back) is too slow
Landing after a jump is too slow
Can't see far enough
Only one life to live

Ideas:
Add lives
Make movement faster
Another idea: Instead of analog movement left to right, make it so there are 3 "lanes" and A/D movement will snap to a lane.
Increase the view distance (decrease the distance-cue fog). If you want to use view distance as a difficulty, start with it high and then slowly decrease as the game progresses. You could make up some story about the player having a torch that is slowly burning out, or whatever.
Instead of solid brick walls, make the game start with walls of bars, so the player can see past them to what is coming up next. As the game progresses, start introducing solid walls more and more often to increase difficulty.
Add monsters and give the player a weapon to swing. Maybe the player can find a range weapon with limited ammo as a power-up. You can make standing and flying monsters, the flying ones the player has to jump to hit.

You have the foundations of something pretty cool but in it's current state I can't give it more than 2.5 stars.

The score sign looks really nice but it takes up too much of the screen.
The character moves too slowly left to right.
A leaderboard would give people an incentive to keep playing, I can help you with that if you want.
Fog is too close to the camera.
More variability and detail in the scenes would improve the game a lot.

It's a good start though, with more work I think you could make it a 4 star game.

I can understand that the game is still in the starting stages
In order to make the game play more interesting, i think you should increase vision upto a few more meters so that the player can decide either to pick coins or adjust his movement so that he could clear the next obstacle.
I think you understand me.
There is much room for improvement.
Good luck.

Another average endless runner, except it's impossible to move fast enough to get from left of the screen doors to right of the screen doors. Character moves left to right far too slow.