Thank you. I'm glad the prototype gave you a few fun minutes. :D
It's indeed a bug that you don't get damage in the third room. :( And as for the second room, if you fall down you don't have to start all over again, as I made this prototype primarily to try out the different mechanics. Also, you actually "die". That means the game counts the fall as a death and deducts points for it at the end. I should make that clearer in the next project. (Unfortunately I can't change the project file anymore, because in the meantime GB Studio 3 came out and the file is a GBS2 file, which got broken during the migration to the newer version.)