at first stage, you summon 3 crossbows, then the rocket launcher at 2nd
your goal is to summon at least 3 cannons and as many rocket as possible
ice and defense reduc towers are shit because of their single target slow attack, but you can place ice tower on the end of ur main base so your towers behind can still attack
at 5h stage you should have ur first cannon
one more thing, dont cast your skills
it takes 5 days if u choose the shiny crystal route then buy crystal with the shiny to get 200chaser crystals since u get 21 shiny crystals a day (21crystals x 5 days = 105 crystals = 1 shiny = 200pcs chaser crystals)
it takes 6 days if u choose the chaser crystal route since u get 33 crystals a day (200chaser crystals x 33crystals a day = approx 6 days)