I love the curve. All you need to use is Tesla and sniper. Just like the other betas. You need to cut down on the Sniper reload rate and bump up the damage of the double guns, but minimize the rang slightly.
there should be a way to reset skills or reset the entire game like sippora76 stated. The bad guys don't grow in STR in lvl 8 and when the merchant Skill is maxed there is just too much money to dump on the long rang towers.
the boosters are pointless as of now because you don't know what 5 + points does. Sniper tower could be doing 40-900 damage, there is no other numbers then the price and the upgrades aside form the boost towers.
the
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