To be completely honest I know nothing about counterpoint (I'd like to know though

). And could you tell me at which places those hidden octaves are a problem? I can't quite put my finger on where you think it sounds most out of place.
And yeah, as I said in my first post I've mostly just put all the ideas I got down for the piece as for now, so I know the unison section at 31-32 sounds sudden.
And I'm having quite the problem to create the tension I want as my harmony knowledge still isn't very vast. So I'd like to have some help with this.