Despite the fact this has 15K plays, only roughly 5 people passed 1-10. So I have some tips guys:
• Each unit has some type of purpose. You can't eyeball a level without it. Even the creature.
• Yes, you need to time in the later levels. Stop spamming.
• The ramp from 1-5 to 1-10 is wild but with enough td game knowledge you might pull through.