I can understand what you feel. But this is a puzzle game and it's not supposed to be an easy game.
I've completed every level like dozens times while testing it and it's quite manageable. You just need a solid tactics and a (little) bit of luck.
Here is two more advices:
1. Keep all your umsolved cells together in the final stage of a level. You have one cell in the left-middle part of the field and three cells in the lower-left part on your screenshot. Try to keep it together. That will give you more options to combine bricks.
2. Try to finish a level in the most massive area of the field - I mean some area with less gaps or blocking cells. This will give you more options to place bricks, too.
Good luck!