Quartet(?) Piece

Been playing around with different rhythms and attempting to create something catchy, but minimalistic. I think I need to extend certain sections, and not move to different themes so suddenly. What do you think? 

Thank you ilv. Do you find that certain sections move to another too quickly, as that is my main concern for my pieces -- I find that I have an idea but never truly flourish it, quickly moving to the next idea. I'll keep working on it. 

I don't play the violin, but do you recommend not playing the pizzicato, if the transitions aren't doable? And perhaps switching to spiccato? 

Very joyful!

Although the music does not sound finished to me, I really enjoyed the themes and how you develop them.
Their is in my opinion enough development and the large amount of themes does not sound disturbing. 
It even makes that the music sounds fresh all the time and it keeps my interest.

Maybe you can do something with dynamics and more contrast in articulation, because I hear now almost only staccato notes.
Perhaps you could create a more 'fluent' theme with broad bowings and sostenuto lines.

The music is fine!

Updated the piece. I'm not 100% satisfied with the second half, as I succumbed to copy/paste frenzy. But I hope to contrast the first section with more of a minimalistic approach. Let me know what you think of it! 

@Sepharite

I think it's great. 

Did you offer it to a real string orchestra?

How about using Col Legno (hitting with the wooden side of the bow) and Bartok Pizzicato (physiclly taking the string in your hand and letting it make a pluck sound when it hits the...  wood behind it. I'm sorry, my english isn't good enough, I hope you got the idea)?

They both are a bit aggresive, so think about it if you're considering adding these techniques to your piece.

What about crazy runs up and down the instruments? And glissandos?

I think that string instruments have more options than any other instrument.

I hope that was helpful (and that I'm not wrong XD)