Your game reminds me a little bit of Vampire Survivors, except with player attacking instead of auto attack.
I usually do not like these kinds of games (except Vampire Survivors itself, but usually don't like most of the clones), but I did like your particular game.
One thing I really loved was how your game with simple shapes as a vast majority of the graphics might be yet still better in terms of gameplay than three quarters of all the Vampire Survivor clones out there including those with fancy graphics. Not only that, but it might, ironically, be better even in the grahpics department than some of those games!
The graphics were minimal yet I consider them very good, even in just the web version. You're right that they look a bit better in the downloaded version, so I went ahead and played that version.
The gameplay is really fun and your game is really well done, you did a nice job on this one!