Alien secret messenger, Calculator and elements, Daily UI 004

Buttons form: As you may saw in my Alien Secret Messenger (ASM) Login screen I used long button as a logo. My idea to use it as button as well. I thought, that aliens may have fingers different from ours, so I imagined that my extra-terrestrial users are going to need long button for their long fingers)
Also, if they transform into humans to blend in, the button needs to be comfortable for human fingers as well.

Icons: I wanted to create icons, that other civilization might be used to instead of ours. Numbers are universal, but "close" icons and math signs can be slightly different. Not too much, because I wanted human dribblers to understand what those mean)
"Close" icon comes from an idea of futuristic doors exit, others are result of several A4 sheets of ideas "How to change "the plus"". The result is not my favorite, but i decided on more recognizable one-s.
Thanks @Inessa Katranzhi and @Vladyslav Soboliev for help :3

ASM login: https://dribbble.com/shots/5039451-Alien-secret-messenger-Login-Screen-Daily-UI-01

ASM input: https://dribbble.com/shots/5113142-Alien-secret-messenger-4-digit-code-input-animation