THE GOOD (what i liked, and what stood out for me):
This is a hidden gem among the games! Amazing effects and art style, with some nice game juice that keeps me satisfied throughout the game, no matter how hard! :D PLEASE PLEASE PLEASE GIVE YOUR GAME A LOGO AND SOME SCREENSHOTS!!! I would love this game to see more attention! The swinging mechanic was nicely made, and everything was "fluid" and moving, which I found aesthetically pleasing. The introduction animation was awesome too!
THE BAD (what i disliked, the bugs, and other problems):
Firstly, like I said before, you have to include a logo for your game! from any layman's perspective, it looks like the person forgot to submit the game and it's broken or something. So about the game itself, I felt like I needed to look very closely to see where I was because of the color scheme. Although I like your 2 bit art style, I think it would have been better suited to have a much higher contrast color scheme. There was a part in the level which I wasn't able to cross, and I spent 10 minutes trying to find a way past it, but it came to no avail, so maybe difficulty is something that could be tuned a bit more. I think there was some clipping as well with the collisions.
THE HARSH (stuff that would just make the game better, usually just personal opinion, don't take it too heavily :D ):
If you are planning to make this a full game, I suggest improving your performance, since right now, the game runs incredibly slowly for most low-end PC's when in full screen, and disrupts the fluidity of the game.