"Frivolous Fires" is a nice name, actually. I'd say that would work well.
Now, before I get into my feedback here, I have to ask - you drew the BG/FG yourself, right? I see no reason why you couldn't
have, being that I pretty much explicitly stated that we're not using any stuff from commercial games. If this is the game, I want to applaud your art skills, as this tileset (FG/BG) is extremely nice.
Anyway, I don't have much to say about the level. Like Milk said, it held itself up quite nicely, and while you didn't go overboard on anything "fancy", it felt creative and progressive enough to work. I have a few minor complaints, however:
If you have space for one more sprite, a second Grinder may work nicely here...
...and if you don't, then I'd recommend getting rid of this flame since it seems to despawn if you approach it from the right.
My only other complaint is more of a suggestion. I kind of want to see you draw some spikes/thorns/something more fitting than Munchers. I'm starting to really grow to resent these, and even a small graphical swap is more appealing than seeing this same plant over and over.
Other than that, thumbs up.
EDIT: I just read your earlier posts, and it looks like you did
draw this stuff. That's really something. I'd love to see you do up a few more backgrounds for the hack if you're interested (once this goes through and all that), since you're pretty awesome at it.