Very cool take on Tetris. I'm terrible at Tetris and even worse at this, but I still had fun with it. It was so satisfying when I finally got a couple of clears :)
One thing that I like is that you can kind of stall pieces in the middle if you time your flips right, to give you time to consider where to put the pieces (or to correct for a bad move so long as the piece hasn't stuck down yet), which for me did a lot to balance out the increase in difficulty over regular Tetris. The rogue-lite elements also seem like they would add a lot in a longer game; for now all I bought was implode, and it already seemed super useful. One piece of UI feedback is that I feel like it would be nice to have the numbers written next to the ability names as a quick reference.
Other than that, no real notes from me. This was really well put together, and a lot of fine. Kudos!