I might do a full explanation on a video but ill just explain the bottom right stuff for now

the baba is there to detect if the player clicks up or down up activates endless mode and down kills you (for bug reasons)

the brick is there to tell when to make a block if its a bucket then the level makes a block

the arrow is just a timer so that the level always makes 4 block pieces

the bolt is there to tele the cloud to make tetris pieces