Pretty cute, the chiptunes and art are charming and it's rather ok for someone who dislikes the genre and didn't put in a lot of time and effort. The idea of the dev as an opponent is also pretty good.
Still, the whole "This game breaks the fourth wall and self depreciates" is just one bit, no matter how much or well you milk it. None of the NPCs had other jokes, and they didn't even have more than two or so boxes of dialogue, which is your best resource for quickly and easily making a game more interesting- you could have made something out of the botanist or the rock collector, I think.
The slimes aren't much of a challenge, I frankly just dodged them all because they seemed cute and it wasn't a hard task to not hurt them. I feel like you could really have benefitted from a wee bit more enemy diversity, such as a fragile speedy slime or a distant shooting slime, plus maybe an enemy gauntlet.
My only real complaint was the lack of any difficulty, honestly. (If you're unfamiliar I promise RPGs tend to be more engaging. Give them a try.)