The nest, spikes and some other things, including the lizard at first, were very hard for me to see. idk if it's because I'm color blind, but I didn't know where to put the egg until I played Regular level 1. I was just pausing and picking levels. The tutorial made it seem like the cave was where the egg should be laid. Overall, the concept and the functionality work great! This is the first one I've played that actually felt well programmed I'll say. Functionality was a 5, I felt like I could depend on your mechanics!