It was quite fun, and the perks/debuffs stayed interesting and varied throughout my playthrough.
One thing I would suggest is showing what changed after this round’s debuff while choosing the powerup for this round since I had multiple situations where the powerup UI was covering the entire board, then I made a wrong choice and had to reset the game (since I couldn’t undo the powerup choice) as there was literally no valid digit configuration I could change the board into :D As it’s often said, bad choices should feel like they are entirely the player’s fault.
also, like those ‘gotcha’ match puzzles, I think it would be a fun idea to allow having two digit one’s in a single 7-segment (for example, this could be read as 11:
x
| |
x
| |
x
where x represents the empty space in a 7-segment.)