I agree what's already been said. If it wasn't for what you said in the comments, I would have never been ablet to clear the first layer of bad guys as pressing 1 acts for a jump, but then i found out that space bar and 1 are 2 seperate controls. Once I got this i was able to glide through the game, but even then it was still difficult. Without seeing your comment to someone else I would have never been able to reach the top. Maybe having a clear tutorial, getting rid of health or combining the 1 and jump button into once while increasing the 1 jump height will imrpove the game a lot as when you get going it does get fun.
Out side of that I don't see how it fits the theme.