Have had this for a while now, good little time waster, runs smoothly with no issues so far. One thing I'd love to see is a change of scenery in the background after a certain amount of time. Maybe the change of environment can bring out some new specific obstacles (think city background, cars and people as addition to it), if they could move that might increase the difficulty and make it even more fun (to me at least !).
P.s: Tap to start in French just says "tap to" / "appuyez pour", it should be "appuyez pour commencer". Also, the word used for score means goal or purpose, I would just change it to score, should work the same in French.
That's all I have to say, looking forward to seeing this game's growth.