Sorry to hear you have been having a tough with Talpa. It is certainly a bit rough around the edges in its current state. Some tips just to help you get a bit closer to the end!
1. You can always restart a level by pressing 'L' on your keyboard.
2. Most of the game involves cutting the wires you see on screen. Wires are connected from power sources to receptors that allow you to open and close the door to the next level.
3. Pressing 'T' will allow you to reverse time. As time rewinds, wires previously cut will be restored. You can use this to reconnect wires you previously severed.
Let me know if this helps!