Took a while to get used to the rune system.
I pretty much spammed ice and earth towers through all the maps. Those seem to be the best at level 1.
And then after a few waves each level when I had a solid defense, I would spam the wave button to have the next few waves attack at the same time.
The bomb rune while expensive, can get its souls back when you've got 7+ waves bunched up at the same time. :D
I actually had fun with this tower defense game. So, thank you. The tower defending was a little easy, but the rune system and soul collecting did balance it out a little. Though thankfully, it was able to recognize the earth rune even when I drew a "circle" (not an actual circle, just a rounder form of the rune) which was useful when I needed to get a few earth towers during a 7+ wave storm.
Only had to restart the last few levels once each due to poor choice of tower or location.
And good luck with your future games. Because this was good for a first.