Thanks.
the idea of the perspective change was that the spiders can only be seen climbing up one side of a building at a time -and you can only change perspective by jumping to another building - so it adds a puzzle element. I do appreciate how confusing it is, and if i had time would have made it a smoother transition as he jumps, which I think would have been better!
When the spider reacher the roof, he spins once - while spinning you can jump and kill him safely - any other time, you lose health.
I anticipated having time to put a sound effect (I'd even recorded one for the SPLAT of jumping on a spider) but there was a problem with the sound in cocosCreator so I couldn't get sound working - I think that would have helped a lot!
As for timing - at the start there is probably enough time as you can track the spiders and anticipate their destination (there i, in fact, some logic built into their movements - not much, but a little!) and they spawn ever faster - so it's a no-win game - just see how high a score you can get.\
if I have time I will try to put an end--game in and also try again with the sounds.
Thanks for your feedback - I genuinely appreciate you taking the time.