Not bad, it's something addictive.
But it has a bug; If you go too far to the left or too far to the right the character leaves the screen. You really need to add invisible walls.
Sometimes objects appear very close to each other, but this is understandable; I know that programming random patterns is pretty difficult.
It has something really annoying, and that is that at the beginning you put 4 obstacles that the first time you play (and some other times) will kill you without remedy.
Good try; I have played several of your games and they are not bad. They only have one or another mistake that eventually with some practice and dedication you will stop committing.
In case you do not, I recommend that you ask friends and/or your family to test your games. They will probably tell you if there is any failure or not. Good luck.
Sorry for my bad English.