The spider is very cute, the music is great and the webbing is fun. In short, I loved this game until before the end which was very frustrating to me. It is difficult to see without shadows where I will land and the platforms at the end were just so small. Then, during the webswing I carefully aligned so often, just for the spider to jump sideways, miles off target. To me it felt also unnatural to have such a big acceleration downwards when you release the grapple point just a little bit too late. The game has a lot of potential and is amazing for the short time of developing. The details always take the most work and I hope you work on them further with more time. Nonetheless, this game is a favourite of mine so far!
Edit: Some of the quirks might be amplified by/because of the web version I would assume.