The idea for this game is really cool. You throw things to build a road to climb. 

There are a few things that make the game tedious than fun:

1. You need to click a lot in order to build a suffice bridge of path, which make it when you fails, it is extremely punishing

2. Lack of visual cue - there aren't much cues to intuitively know what is happening or what the player should do (I click the flag twice because i thought it do something)

Overall, an interesting idea with great potential. 5.5/10

This was really cute! Well done =)