Hey Kachin! I had a go at your game!
The first thing I noticed is that the screenshot you provided looked nice!
In fact, I quite like the graphics overall, tho at the start of the first level, I wasn't sure if I was jumping or if the ground was moving down away from me.
As for the level design, I have some suggestions
* Put spikes in a little pit of there own, it feels bad to brush up against the side of a spike and die for it.
* Make the moving spikes into a creature of some sort, the part in this image is quite hard, which in it's self is not a bad thing, but it would feel better if it was a monster that was besting me multiple times rather then an inanimate object.
* Get rid of blind jumps, this killed me the first time and it was frustrating to have to restart the whole level from something I had no chance of knowing.
Despite these things, the game is still pretty fun at its core and I encourage you to keep up the good work mate! :D
Good luck!