Wow...solved the game. Amazing cause i honestly never expected that to ever happen.
Well, to be serious it's kinda hard. Maybe too hard.
It used me way too much tries on some lvls.
What i also dont get is why did i never reach a lvl 5? Not even at the last lvl where i at least got a lvl 4.
Well anyways and for those who are interested.
I've just been building straight towers right next to each other. No mixing or stuff.
On some lvls you need to be luck with your starting gems so you get them doing early dmg and not non needed utiliy like EMP or Hunter.
Also i had to realize i need to upgrade spells and leave some gems.
Just left the Small Bomb and Mover on lvl 1.
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Thanks.. level 15 bug is eluding me.. shenanigans!