Show a full upgrade tree and when you move your mouse off of the buttons in-game the bubble should go away. There should also be an option to remove it.
Maybe something to auto-produce troops as well?
You should be able to spin Bastions when you're trying to build them. On the maps where enemies come at you from multiple sides (or if you're trying to have fun) it's helpful.
The only problem with the game is that if you have the SFX and music muted in-game, when you win it plays the music. Other than that, this is brilliant.
yeah so, the game is fun... except for the fact that some of the notes get randomly moved and you cant get them without going off beat. those just mess you up.