Great art! Well, the animations are really lacking, but you explained why that is. The designs for the backgrounds and characters and such are clean and attractive. Also, I thought the it was fun to play, which of course is good. ;)
How much you copy from Mario games (specifically Mario 2) is a problem, though. The sound effect when you pull up a plant is directly taken from another game, isn't it? And, other than the art, it feels like 90% of the game is taken directly from Mario games. Big spinning gold coins that are sometimes found in floating square blocks with a question mark on them, a gold star shaped power-up that makes you invincible so you can just kill enemies by running into them, instead of only being able to take them out by jumping on their heads. And, from Mario 2, pulling up plants out of the ground, and being able to hold the jump button to float, like Princess Peach. If I paid money for this game, I would be disappointed, and it kind of sounds like that might be your plan based on what you said on Kickstarter.
However, if this is just a practice game for you to learn how to make things, those issues aren't really a problem. :) It is fun to play and it seems like you're getting a handle on how to make a game. I just hope that when you move on to making Team Notion you get a little better at including new ideas of your own and leaning less heavily on ideas from other games. ;)