I like the concept. I like the bell. The actual mechanics seemed pretty solid, but overall I found it difficult to "read" what was happening on screen. I think the shader was perhaps a bit too noisy, or the projectiles/explosions to small, and the text could have benefited from a containing box with a solid background. Just minor changes so that someone who is new to the game and doesn't know what to look for, can still get the important information the need from the visuals.