I played the game a couple days ago and got frustrated. I'm not sure which of the updates it was, but I love this game so much more now. Thank you! Can't wait for the next one!
The scaling is off. The first 6 levels are stupidly easy and then the 7 is really tough and by then you've bought all the upgrades (so no help there) and you can go 4 waves out of 5 without a level...so ends up being very boring at the end :(
I think the scaling can be completely subjective. It all really depends on how you allocate your talent points. Someone who follows a consolidated build strictly in one tree may have a lot harder of a time than someone who spreads their skills out between the trees, i.e. - getting all three Tier 1 spells and mixing it up a bit. I'm sorry you didn't have too good of a time with the game. Games like these are incredibly tedious to balance so it may not suit everyone's taste but I'm glad you gave it a try!
If you try to use strategy on this game and build a mix of towers in great places with obvious strengths...you will have a hard time. If you instead just build crossbows everywhere, you win. Yay... :-/
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Glad we were able to make it a better experience for you!