Hi DDmeow,
Glad you were having fun with it!
It sounds like you might benefit from checking out the 'Controls' and/or the 'Learn to Play' areas of the main menu. You can rotate tiles with the shoulder buttons / bumpers on game-pad (We recommend game-pad) or with right arrow / tab on keyboard by default. You can rebind the buttons in the controls menus if you have any issues with the default control schemes. Line clears are triggered on 10 (or more) bricks in a row (Same as Tetris). You can look for more clarity on specific mechanics like this in the 'Learn to Play' menu.
We are trying to implement some ways to better onboard new players but for now these are the tools available. I hope you give it another go with the other tools and knowledge. The game really picks up with a bit of practice. Internally we have had a lot of fun pushing ourselves to get better at it. There are some tips and tricks you might learn from looking at the video on the store page too. Best of luck!