Just played the game and it's not bad at all. For some critiques I would highly recommend some background music. It doesn't have to be great, but anything to break the silence would be better than nothing. If you have the time in your next game I would even recommend putting sound effects on everything you can (buttons being pressed, gems collected, ect) they really make the game feel more alive and are overlooked my many people. Other than that, I see other people have already commented saying the controls were strange with the turret selection so I wont say much on that, but make sure you get people who don't work on your game to play test before releasing it to get feedback on controls.