Hi SlyBalto! First of all thanks for playing and making review for my game its mean a lot :)
I totally agree about the music and sounds. When I started making the game, I didn't care about the effect of music that much, but now I understand better. The music you suggested are good examples :)
There are moving obstacles in the game, but it first appears with level 21. I guess it's a level design mistake because having similar obstacles for a long time can be boring. Maybe I should have gotten it at earlier levels. I will try to apply what I have learned.
Thanks again!