You get achievement points whenever you get an achievement. 100 achievement points award you 1 spec point which can be used in the specialization menu.
Pretty good game and great start, I WOULD spend some money on it but I guess that won't do much for me considering some items like a pair of pants or something costs as much as over 100 kreds for one. Would like a ruby reduction for paid items.
I did that with barely just enough (250k dmg challenge) Had like lvl 6x archer with maxed out fire rate and around the end I had it doing around 240~260 per shot or something like that with full map range, also had the fire arrow thing going on (piercing and slowing) so I got ALL of them. Double armor double health double enemy +30 waves still only made 269k dmg
@IRowk666 Decrease tower build SPEED means that it's slower, your explanation is for Decrease tower build TIME. Increase tower build speed therefore makes it build FASTER
Not at all =) Thats why your rewards increase significantly as you level up and acquire more rating =)