DC is about the only disc console (3do and others that barely sold may also allow it) that you can run homebrew on without a modchip/etc. That's a significant factor for PS1 and Saturn.
https://www.kickstarter.com/projects/spacepantsgames/rocket-panda-a-delicious-rocket-adventure-for-sega-genesis
Rocket Panda for the Genesis is starting its kickstarter soon.
The Meating (NES) Kickstarter is starting soon. https://www.kickstarter.com/projects/megacatstudios/the-meating-a-new-game-for-the-original-nintendoYT trailer
I don't think Alien Cat 1 has a SNES port?This also doesn't concern any of the other ports of Alien Cat 2. The NES/Genesis/SMS/etc versions have no issue.
You should know that at least the SNES Alien Cat 2 demo was made using stolen code from Mega Cat. Valdir Salgueiro, after parting ways with us, took with him our proprietary SNES code and used it to work on this for PCSD games. It is highly unlikely they'd have rewritten it based on the other SNES toolchains available, and Valdir is listed on the KS page. Do not support the thief.
I think he may mean the official devkits and the like, the use of which would indeed be illegal. N64, DC and Saturn are places where some homebrew still uses such illegal code, older platforms don't really bother anymore, and even on those three it's getting rarer.