So...
- Difficulty seems fair: i really like the idea of weak points and how you can use your web for advantage.
- It'd be good to have some sort of HP-bar for bosses... and checkpoints between phases?
(just repeating other comments).
- I love style of this bio-mechanical world and how it sounds. Reminds me of Geiger, microorganisms, carvings and some other things.
- How about making Spider Bot stand out from the environment (slightly colored parts f.e.), just a little bit?