Not seeing it mentioned here but the big difference from a first glance is the RF capability. This is little more than a 433 MHz replay attacker. Maybe you can generate arbitrary data out, as long as it's the ook modulation. I'm sure there's a great use-case for this, but avoid any delusions of grandeur, this is very cut down.
The title blurb seems to present it as a functional clone, rather than a limited copy.
"A Flipper Zero clone, but cheapest, DIY and simply Open Source, made with Arduino IDE"
Why not?
"A hobby partial Flipper Zero clone, cheaper, DIY and Open Source, made with Arduino IDE"
So it doesn't have to be clarified further down. I get that it's not that down, but the title is what will be shared and seen in web previews everywhere.
That being said, it looks very cool, and the name is fun.
" Important Notice: This is just a fun project, it was started to pass the time, it is not at all professional and is not intended to be. Is not an alternative for professional device."