Hey Mark,
Thanks for sharing your game! I haven't had a chance to play the v1.2 version, so my feedback may have less context.
Overall, I enjoyed the experience, but it was difficult for me to control aiming. Have you considering a control scheme that would allow for moving and aiming at the same time?
Additionally, I was slightly frustrated by the 2nd to last level because I found myself often getting stuck in positions that forced me to restart the level manually (this occur less often in the other levels).
Thanks so much for sharing your development experiences on Youtube and I wish you the best of luck on your continued development.
If you ever need another Unity developer's input on a specific problem, feel free to reach out to me on Twitter @GamingGameDev :D
~GamingGameDev