I added a mob counter that makes each room have more mobs than the last. There is a random component, so the number isn’t fixed, but in general each room should be harder than the last. I created a logo screen and a preloader for the game with a progress bar to indicate amount loaded. The file is only about 2.5 megs so its pretty quick. My last game was around 16 megs – I guess it was all the dialog and sprite sheets.