Nice idea for a game, but it's too short. No sounds, and I wish you could do more. control more of the character's actions.
Reviews for "Happy Runner"
It's a nice game concept, but could use more levels that are challenging, and some additional designs.
It's alright I guess...But it needs more levels...
I find this quite enjoyable, needs about 50 more levels, and more concepts.
Another interesting thing to try is if you can get the level to continue 'endlessly' as it wraps around, so instead of returning to the left it just loops around.
Music/effects/sound controls would also be good.
Otherwise I quite enjoyed playing it twice, as the second time I tried to see if I could fail (like I could in the first level by jumping over the finish line).
It's a good concept, and you're on the right track - you introduced the mechanics gradually without a tutorial, which is a good start. Now just make more levels and add all the other bits and pieces!