I'm gonna tell you about 2 questions Where's the red herring (or win block)? Are you have been reading about How To Share A Mekorama Level.pdf?
Welcome to the forum @yuan! That's a fairly intricate first level you created. I finished the level, but I was somewhat frustrated with all the mechanisms not working very well throughout. Altogether it's an OK level. It's just that it could use a bit of work to make it play more smoothly. Unfortunately I do not have any specific advice. I'm sure with a bit of practice, your mechanisms will improve. I gave you a bonus star because it is your first level. Thanks so much for your creativity. I'm looking forward to your next level!