What a cool game! Reverse tetris by way of digging through the stack is a really neat idea.
It took me a minute to get the gist of things, but once I started to understand, it became really satisfying to play. Hitting combos feels especially delightful.
I did struggle a little to keep track of my energy - obviously that's partly on me for playing bad! But some kinda visual and/or audio indicator would've felt really helpful to let you know when you're close to running out without having to take your eyes off the action.
The core concept here has legs for days, and I really enjoyed it!