Adding some short info with my tip I just posted.
I see some symbols did not get posted but hopefully the explanation will help.

Also you can make bombs with going zig zag and ending in right or left direction.
So all kind of shapes without more than 2 horizontal or vertically.
But has to end right or left.

Then the 45 degree signs like V and /\ as I explained in my other tip.

Not L shape because that has 3 vertically or 3 horizontally.

Hope this made it a bit easier to understand. :)

In this level you have to make 14 bombs in less than 17 moves.
Bombs can be made with 5 monsters, there are several ways of making bombs.

Easiest said is that you have to make a shape of 45 degree signs with 5 monsters.
Either it be v ʌ or the shapes where the one line is horizontal and the other diagonally.
Also can circles of 5 monsters can make it but be sure the last ends either left or right.

Examples:
1.Start with 2 or 3 in a diagonally left or right up direction and end with 2 or 3 in a diagonally right or left up direction to create a shape.

2.Start with 2 or 3 in a diagonally left or right down direction and end with 2 or 3 in a diagonally up or down direction to make a v or ʌ shape.

3.Start with 2 in a horizontal right or left direction and then go 3 in a diagonally up right or left direction.

4.Start with 2 in a horizontal down or up direction and end with 3 in a diagonally right or left direction.

5.Make a circle of 5 with the 5th ending on either left or right direction.

Hope my explanation is helpful. :)