Nice game! I like the core idea, so it's cool to hear you got more updates planned.
The choices after waves works quite well, but I feel like the health upgrades are kinda useless. Once the enemies reach you, you lose health super fast, so I just never picked those. Some balancing may be required there.
I appreciate that you kept the art in a consistent palette, but I noticed that the web build doesn't seem to match the screenshots?
Anyway, good stuff!