Thanks a lot for the feedback! Since this is our first unity game, we are sure there are plenty of performance errors. Yes, all the objects are destroyed. We stack the modules (which contains the background and blocks) in a queue of 10 items, so when a new module is spawned another is removed. We think that the lagging issues the game has on the higher levels (when more blocks per module are spawned) are due to the fact that we modified the projects fixed timestep, making it significally slower to manage the collisions. We will be working on it to make the gameplay smoother. Thanks again for playing :3