Great game. A lot going on under the hood here and a serious amount of work for a solo dev in a week. I am impressed!
I have played a bit too much vampire survivors and so got quickly sort of over powered, but I still got the dopamine hit of surviving another wave and wanting to see what next upgrades would be.
If you add some more juice to this, e.g. softer lighting, explosion and player damage sound effects, camera shake on hit damage and other things like that - this could be a seriously great wee game - focus on building out that lore and arenas too and this can find an audience. It might not be your intention - and sure the genre is pretty busy - but with with a bit of polish...
Thanks for sharing and again, well done on getting this submission wrapped in the week. Kudos!