The on rails 3D world was very cool.
I'm impressed how much levers there were. my game got stuck after defeating the red boss. I think that was the end but I wasn't sure.
The shooting felt a little but boring after some point. maybe an alternative fire-mode or something would have helped.
I also took me some time to find out I had to shoot the switch to start the game. But after that point all the controls were clear and obvious.
keep up the good work.