won hard again, here is a basic rundown.
build 2 green towers, one in the lower right corner of the curve, one in the lower left. as soon as you can afford it buy a third in the upper left. upgrade #1 then #2 then #3 till the wave of red creeps, then buy a pink and up that to lvl 3. from there its smooth sailing, after first boss max ur towers n buy 3 blues, max those also.
then start building 2 big splash towers and upgrade them. see that u buy a third one before wave 30, prefferably sooner. the boss @ level 42 is a bitch, never managed to kill it so far. at around lvl 46-47 i sell all splash and buy snipers (6-7) and max them. I always win with one green gem left.
thats it, hope it works for you guys.
I beat easy and normal but hard and endless just seems impossible to me :/
anyway IMO pressing space should either trigger monster health on or off...tz rly annoying to press it all the time cuz the healthbars disappear, also the buttons sometimes dont work properly and the tower AI is umm... welp it could be a bit better ;D
4/5