For days, this devbuild was only available from my website. But I think it should be available here, because the game is currently postponed.
0.3-devbuild 7 changelog:

• Fixed a crash when loading a level from subdirectory

• Added “Sanctum” background

• Fixed a bug when the camera goes out of bounds in the editor

• Added flagpole (finally)

• Game over screen when exiting the game (if lives goes lower then 0)

• Added F12 key to insert any object that exists in the game (editor)

• Added note block

• Added mouse cursor for the editor

• Updated Level 1 (probably final)

• Fixed a bug when block sprite remain the same when changing backgrounds in the editor.

• Fixed crusher overlapping the HUD.