Hello,
This is a very innovatice gameplay, never seen anything like this before. The music reminded me a lot of the old school arcade games and a little of vampire survivors too. It's a pretty good game.
I found the experience a little confusing. I am supposed to hold the button but then I keep getting whacked by all of the enemies. The only way to attack them is to let go of the button but the enemies are too fast (or the browser is laggy) and the enemies hardly get hit.
The other aspect of this game that is not my cup of tea (but could be others) is to press and hold. As someone who has RSI, that is hell on my hand.
Maybe I have been playing it wrong and there is a better easier way to play this. But if there is, I didn't find it obvious so if you continue to work on this game, maybe that's something I would request.
Good luck!