Really nice game, it was quite fun to play.
It was a little difficult to understand how to use the stair, but after some time, it become more easy.
However, as you advance on the level, as the resources are scarce, it become really difficult and fastidious to restart the level each time you made a small mistake (Missing a bullet, or destroying a block, just a little too much to the left, for example)
The game was really nice though, so keep the good work !
And by curiosity, I see that it is a Unity Game, how did you to make the game having a "save state" ? I really don't know how you made the game remember I have x Cookie, and y mega-cookie, even after refreshing the page.