Enjoying the idea! Having the button instruction in game (on the sides) might have helped a little to not get sidetracked to check the description on mode switching
I love the switching animation
I wish the balls a bit easier to get, since the tetris piece are too random and don't have hold piece button, so it often go for a lot of piece before I could get anything to fill the gap with(like the straight line) so I ended up being stuck in one mode longer than the other when I feel I should spend around the same amount of time equally.
Having powerup in breakout mode would help a lot so we can play longer loop of the game, since tetris combo only give balls and breakout only able to destroy so little of the lines.
The concept is there though could very well be a game to enjoy in spare time ^^