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!!

Super simple but very polished. 
The second level certainly ramped up the challenge!

Good stuff, congrats!

Great game with a simple mechanic to learn yet hard to master, I love it!

It's hard, but it's addicting. Really give me the challenging vibe of old gameboy games.

The gameplay is really great, with level design, that ramps up a bit too fast for my taste, to match. My only complain that area would be to press jump again to activate the mid-air jump, instead of just doing immediatly after slashing.
The game is a bit buggy. Hitting ceiling spikes of from the top, which makes the first jump in the 2nd stage extremely tight, or the game randomly locking up for a few seconds after dying.

Needs some polish, but otherwise good :>

This slashing is really nice, I love the twist where you can only doublejump if you slash a plant first and the constant pressure of screen scroling is just that thing that keeps you super focused. This type of game is just mu cup of tea when it comes to gameboy.Good job man!