I like your take on the survivor style games by combining it with tower defense! The beginning is a bit hard though, especially with how it only takes one hit to die and the enemy hitbox are quite unforgiving. But the core loop is pretty fun.
At the start can be a little bit hard, I have to admit that, because sharing the currency and HP at the same time is not something that a lot of people expect when entering the game and one shot is pretty easy indeed. Hope you liked the game!