The game is still rough. Needs options for muting, volume, sound effects, etc (without having to quit to menu). Also the option to restart, so you don't have to wait to commit suicide everytime your ruin your streak.
Easy to beat; just make towers instead of solid walls. The enemy will then walk past the towers instead of attacking them (most of the time). Just make sure they are built up enough to kill the enemy as it walks past, so it doesn't kill your base.
 "Bubble Tanks 3"){kind=icon}
 "Survival Lab"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "Fade"){kind=icon}
 "Picma Squared"){kind=icon}
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 "Pyro"){kind=icon}