Glad you liked it! I didn't want the game to be hard, just a demonstration of the tech I worked. The laggy part has to be an issue I fixed a day or so ago, I just haven't updated the file on Itch as I'm waiting for the rating period to end to upload any mayor changes. I left an auto benchmark node connected and it seemed to be firing off randomly during gameplay, I apologize!
I also know what checkpoint you mean, I accidentally moved it down and the overlap doesn't trigger, my bad!