Here's a tip
There's a way to make your vector art look good even if you're not good at drawing. Single-pixel strokes make your drawings look like crap. Either use thick strokes to go for a cute cartoony effect or use no strokes at all to go for a cooler, more serious effect. Like those pointy cave backgrounds; those looked pretty good. I for one suck at drawing but I can still make passable artwork.
Anyway, I like the game, though it more reminds me of old school Flash games than old school 8-bit games.