I understand that you wanted to achieve the feeling of a fly struggling to move in the web but sometimes it jutters me right back when I press move button and I get caught as a result.

nice job, i wish i had a little more space to see the spiders coming so i could dodge them. congrats on finishing and submitting a game to a game jam!

Must be a first timer... 

Nice and fun game, if you want to be able to hold buttons instead of having to press, use 

Input.GetKey

not

Input.GetKeyDown

or even better, use Input.GetAxis("Vertical")

which u can then insert directly into 

[rigidbody].move(new Vector3(0, [var], 0));

or

transform.position += new Vector3(0, [var], 0)

Goodluck on your game making journey :)

Intresting Idea but without any prompts you can just stuck in a few minutes at the start because of strange movement of character when you colide with up or down border you just thinking why? I press up but it doesn't move! So it will be better to do that it will be not invisible but some sort of thing that you can understand, That a border. Nice work and cool ijncreasing difficult I think you caught a good balance in skill of player and difficult of level, so it doesn't start to be boring. Good luck, and see you next time!