Very good game, loads of mechanics, quite fun gameplay, even a secret that I found completely by chance. The only things I would change are that I would reduce the gain on all the audio because it is a bit crunchy at times, and I would give the Pentagon a tiny bit of spin during launch so it doesn't always land flat, i would imagine the amount of spin either influenced by the direction of the shot, the power, or just random.
And lastly, if the game is oriented towards mobile phones, I would suggest putting an FPS limiter, as it does make my phone heat up a bit.
anyways well done 👍