Really enjoyed this one. I found it to be well balanced, and the choices offered within the shop and during the game really force you to think strategically and work with the hand you've been dealt, especially towards the end of the run.
The only additions I'd suggest would be a different background image for each level, to make it feel like you're really getting deeper towards the core.
And also the sound that plays when you visit the shop is absolutely ear-grating and made my cats dart across the room in a panic. Other than that; great little playdate game! And definitely one I'll be returning to, hoping to see a future catalog release one day.