This is an awesome little game!
You took such a simple concept and polished it so much that it became extremely satisfying to just amass a giant sword and essentially just swing it around randomly, getting kills with the effects is a great feeling.
I think there is some benefit to having the controls display somehow within the game, as opposed to only on the itch page. Even just the buttons written on the sidebars would do fine because there really are only 2 things the player needs to know. But also a small tutorial at the beginning would do a lot to get players right into the action of the game.
After awhile, it does become a bit of a mindless collect gold -> swing weapon, and strategy isn't a huge factor into what the player does. Although, there are a few things like the shield guys that take atleast a little bit more planning on the players behalf, but the frequent and random spawns hinder the amount a player can plan ahead. And this design works fine on its own, and is very fun to play anyway, so if your intention is just an action game then disregard my next paragraph.
It does make me wonder though how it could play it the movements were a bit more methodical, not slowed down to the point of where it is a puzzle game, I think the action pace of it is one of its core strengths. But if you had asked me anything that I had done during my run, I wouldn't be able to tell you other than "well, I just ran around and clicked every once and awhile." Maybe these could be split into different modes, one where chaos and little thinking is preferred, and one where a little more methodical approach is needed.
Anyway, this is such a fun game to play through, and trying to get a high score is very fun. And its very nice to see people posting high scores, that is always a good sign of people enjoying your game :)
The artwork is very cute :) I do wish the gameplay art and the title screen / intro are were more consistently themed though.
Great work!