Thanks for your feedback! :)
Yeah, I worked the first two days only on the input system because I could not make it work with the input system from unity. I tried around a bit with the wait time, currently it's 0.3 seconds, didn't want to make it much shorter, because then, you may not be able to make a double tap, if you are too slow.
I wanted to do something like color change or maybe make the eyes look a bit more angry or something like this, but I didn't have the time. And, I must admit, I prefer the coding part instead of doing graphics and that kind of stuff. But a friend of mine, who wanted to do the 3d models and textures didn't have time, so I had to do it myself ^^
Maybe I will do some updates and try to improve it. I also have some other ideas in mind, I want to try out :D