It's a very good game, but I'd like it more if 1) it allowed WASD + JK as well as arrow + ZX controls and 2) if it saved progress and let you either start a new game or continue if there's save data.
If you do implement saves, I posted code for a couple of approaches to prevent the issue that Unity has of losing people's save data anytime you post an additional update in the future so you might also want to implement one of those: the more straightforward one was https://3p0ch.newgrounds.com/news/post/1086279 or you could cannibalize the code from https://3p0ch.newgrounds.com/news/post/1099579 which also makes it so you don't lose saves but is more work to implement than just using PlayerPrefs.