found a great strategy
hey for everyone who finds this too hard, i played like 2 days straight and found 1 strategy that worked lvl after lvl, first, with whatever skill points you get, max the gem one and the life one, so you start with 3 gems and 125(iu think) life which gives you massive more points at the end... the at an intersection on the map, construsct 2 mushrooms(with the money in the begining) and add the gems. then go on til you have 5 mushrooms at the same intersection with 5 diff gems... then just keep upgrading and adding the same gems making them pure and eventually level 6..
one thing, make sure to upgrade the thunder one first as it attacks faster therefor dealing much more dmg
another, if there no intersection, you might have to build one extra tower a bit later on the map because the towers wont get a chance to attack twice...
this strat got me gold on every map the first time i tried them( after i played like 2 days on the first level)
hope this helps!
By the way, this is one of the best tower games ive ever played, top 3 for sure...i love defense tower games its all i play and this one has no flaws!!!
good job