I think this is a really cool concept for a game, the on-track nature really gives you the feeling of being at the whim of something else's command. I was a little confused when it talked about being able to defend yourself now, did that unlock a new ability?
If you wanted to improve, make it so the character doesn't start moving until they press E by the first button and create a circular track in the first room until the button is pressed. This would give the player time to learn the controls instead of just restarting a few times. On top of that, some sort of button click and door unlock noise could really help the game feel more responsive. Lastly the text box at the bottom could be a little bigger, sometimes text would leak outside of it
Overall, fun game! Can't wait to see what you do with it moving forward. Good luck! If you have time, check out my game: https://itch.io/jam/gmtk-2020/rate/694820