The art is great!!! And you have a title screen AND loading screen?? What the crap. :P
I was slightly disappointed when I could use controller for part of it, (starting the game and jumping), but attack wasn't mapped. So I got confused at first. Easy to get past, but I wasn't super clear on what I was doing exactly or what collecting the diff plants did? Are they points? Maybe if each one gave you a diff ability as you went along it could be kind of a fun loop? Like a boost or an extra hit or something?
Really nice work!!