I gave it 2.5 stars because it has a lot of potential. The artwork is very nice, game concept is not bad at all, and I think it wouldn't be so boring if it didn't glitch the whole entire time. Here are a list of the glitches I found:
-When you get past the first wave, the second wave doesn't come, making it into a never ending game of nothing but eating humans. It's time consuming to try and restart the level until it does work. This is one of the main things needing to be fixed.
-When you click on the mother tree, a good portion of the time it uses up some of its' attack on itself. Also another problem with this is trying to click out of it so you don't have to use it on nothing and waste an attack you might need a minute later. A good way to fix these issues is by having the coding only let it attack near the ground so you can click up in the air and not have an issue if you accidently selected the mother tree and now have to use up the attack.
-Trying to move the characters is a bitch in the game, specifically when there are enemies near-by. When trying to move or use Venusbite or Ironbite, it proves to be impossible if there is more then one enemy to be right next to your creature. You can't send out the minions, and you can't move away because they go straight into attacking the next enemy. A good way to solve it with those characters is letting them move when they are eating, so they can get away or be placed right where you want them to be.
-The game lags about half the time in the levels, and it's usually when enemies are attacking you, which makes it even ten times harder to try and move the aliens away or use the special attacks.
-Half the time when trying to click the buttons for upgrading or evolving in a level, the buttons don't work. This also goes along with the special attacks. Sometimes the buttons get confused as well, and you click something like upgrade and evolve happens instead.
Here's some things that I find would make the game play better:
-The tutorial boxes continuously pop up in the main menu after having read them and exited out of them, which gets pretty annoying. Please include an option to turn off the tutorial, because it can be extremely bothersome.
-Showing which achievements you have earned from previous levels so you know which ones you still have to go back to earn.
-Letting the game have an option to make it bigger so it's easier to see and enjoy the graphics.
All in all, those are the notes I have for this game, it could be a lot better, but it wasn't bad. I liked the different type of levels you had going on as well, and maybe next time you create a game like this you could get more of that going.