How it played:
-Tried my favorite strategy: spam snipers - didn't work
-Tried obvious boring strategy: spam basic units - did work, but only initially (sign of good design)
-Realized I can upgrade towers
-Had some genuine challenge for a few levels, few thing making through, good times
-Started focusing upgrades on a sniper, with 0.075 speed I could have probably sold everything and still won
Overall it's pretty solid, plenty to suggest level and balance wise, but that's still part of the design from the state the game is it seems. Too bad we got to play the worst level out of the three shown in images.