TLDR: The game is hard. VERY hard. And not mechanics hard, no, it's numbers hard. I only endured playing to the fourth level, at which point, after losing on it, I decided I shouldn't waste any more of my time. Don't waste yours.
In a more extended way: The game expects unrealistic things from you. To build towers you need yellow sprakly clouds. To get sparkly clouds, you either have to wind your music box or kill enemies, the stronger the enemy, the more sparkly yellow clouds you get. The clouds home in a little too weakly towards your cursor and you might end up not collecting them but already pointing at the tower or upgrade you want to buy, making the cloud go behind the buttons and for some reason not collectable while behind them. The music box is a little too slow at the beginning or the beginning is happening too quickly, depends on how you wanna look at it. At the beginning of the levels, you are given enough time to make 6 clouds. you need 5 to either get a star tower that shoots forward, or to upgrade the speed of your music box slightly. At this point enemies are spawning in. And on the first level, it's just one, and then gradually increasing in numbers. But from the second level forward, they spawn 2 and not only the hands that are the ''normals'' but also the heads which are tankier and move faster if they go below half health. After you deal with them or even before that, the game will start spawning even more. The game introduces new enemies somewhere before you reach the mid point of the level. Since I already told you about the first two, I'll tell you the rest I have seen. Third is the eye, it acts like a zomboni and has even more health than the heads. The fourth is something, I really can't tell, maybe like a plush or something. It makes music, every other enemy on the playing field except for this kind of enemy is now sped up permanently, oh and also, this enemy has even more health. The fifth is a tricycle, it will wait at the right side of the lane for a little bit before going down the lane quickly, killing everything in its path and then killing you, this one has as much health as the eye probably, making it pretty much impossible to kill it why going down the lane. Now let's talk about the towers. First is your music box, it is the cloud producer. The only cloud producer you have. It's also not very fast and you have to manually crank it, but you can upgrade it for 5,10,15,20,25 and finally 30 clouds, making it slightly faster with each upgrade. Slightly. Barely noticable after the first upgrade. Second is the star, your peashooter. Cost 5 clouds, does its job, pretty reliable. Third, a balloon and a pump for 10 clouds. This is your cherry bomb. One you have to charge up manually by rapidly clicking it, not like the music box which you only have to click and hold over. Takes a looong while to charge. Not worth it in my opinion. Fourth, toy soldier for 10 clouds. This one can shoot anywhere on the map, BUT you have to manually click it to tell it which lane to shoot at. You have to do that to every individual one you have. Fifth, teddy bear for 10 clouds. It's just a wallnut, haven't gotten to use it. Sixth, a race car for 20 clouds. It's a jalapeno. I never got to use it, so I don't know if it fully clears the path regardless of where you place it, or from where you place it onwards to the right. Honestly looking at the way this game just loves being annoying, I will guess the latter. And you probably have to wind it up to make it go. And it takes a long while so you can't use the insta as a normal insta, but as a ''stored'' insta.
This game just makes me angry. You might say, ''Why do you know so little? You should have played for longer!'' and to that I will invite you to try getting further and seeing why firsthand.