want to make different stars? put in 2, -3, 2 and then add another 2 to the two twos and add another three to the three then try to see what it shows. Then, repeat the process.
To get the chest on lvl 3 you have to wait until the bird has gotten as far left as possible then jump once onto the bird at full speed, thus giving a double jump to go the rest of the way.
Great game, great concept, nice design, except for the synchronization rate, I have to say its terrible, fix that some more, and you'll have yourself an excellent game.