A classic idea, but so very well executed!
First of all, the minimalistic presentation is great - few colors that explain each other very well. I also like the little "trail" effect when you jump. Oh, and that smooth flag animation was sweet
The levels have a very good feeling of progression, going from the classic "make a bridge over spikes" to the introduction of fire and lasers, where now deaths can happen in mid air and you have to plan carefully. A short, but challenging game!
And the last bonus levels are so precise! I felt so satisfied when I finally cleared the last one.
A very solid entry indeed!