Reply to Constructive feedback about my tracks so far!

Hi guys!
I am a new brazilian producer and I have produced some tracks so far and I would like to get some feedback from you guys, what do you believe about them? What can I improve? Are they sounding nicely or not?
I also look for some producers who would like to work together, do some co-productions, or something like that. anyone interested, my contacts are in my soundcloud page:

https://soundcloud.com/camilo-damiao
https://www.facebook.com/camilohfdamiao

Please, give me a feedback about my tracks!

https://soundcloud.com/camilo-damiao/surprised-in-darkness
https://soundcloud.com/camilo-damiao/from-space-to-egypt-camilo-damiao
https://soundcloud.com/camilo-damiao/dark-getaway-camilo-damiao
https://soundcloud.com/camilo-damiao/reaktionsong

I hope to hear from you soon!

Best Regards!

Camilo Damiao