It's a bit rough around the edges.
The graphics are way too crude, there are no dangers that could hinder your progress, and the final boss fight was a bit glitchy. However, I must admit that besides those flaws, the game also has some good ideas going for it. The story was creative, the levels design was good and thought out, and the game itself wasn't really all that bad, and it did deliver me some entertainment! It shows, that you're capable of creating good games, so I advise you to keep learning and improving skills that will help you with game development!
That game, actually reminded me of my old projects I used to create for fun in The Games Factory 2 (now known as Clickteam Fusion) when I was younger. Those projects, honestly weren't better than your game, they also were rough around the edges, if not more so. So, from my experience with game development, I can say that what you've created is pretty good for your first game!
To summarize, it's not bad for your first game, but you still have a lot to learn.