The game is really nice to play, is very satisfying, there can be small improvements for the game such as telling the player when you can use the sycthe, either in form of a disctintive sound or a small bar filling up, another improvement would be for the music can be improved, there was a small melody that was kinda happy tone compared to the rest to the rest of the music making disparate and can you make a small improvement in the Skeleton AI, It kinda sucks, I have been in situation in which there was a narrow corridor where the enemies were at the end of it, and I am waiting for the skeletons to go and shoot, maybe a way to solve this, is to add game mechanic that allows you to control them with right click or rework the AI system to be more aggresive.
I see this game has a lot of potential if you continue developing the game, how much? you are asking probably, I'm talking to be a semi-huge game kinda like Nuclear Throne (sorry if you didn't like that comparison), but if you create small quality of life improvements for the game, having more content and developing the game's personality that makes it stand out from other games, it can be best-seller in steam.
But anyways hope you are doing great, you have a really nice game right there!