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For the Linux users out there, I am still updating the installers on Lutris with every new version release of S3D2D at https://lutris.net/games/sonic-3d-in-2d/. You may have to click on "Show unpublished installers" to see the most recent ones. The most recent as of this post are 1.20 and 1.20 + DLC.

For any Linux users out there I have made some Lutris installers for the last couple of versions of S3D2d. Lutris is a Linux game client that aims to make Windows and other games easy to install. The installers can be found at https://lutris.net/games/sonic-3d-in-2d/. The installers haven't been blessed by the Lutris devs yet, but seem to work well on my laptop with Intel graphics. Hope it is okay that I post this here. Thanks for the hard work Sotaknuck!

The only way I know that would possibly work would be to somehow get Wine installed or to use a virtual machine with Windows as the guest.

Sure, that will be fine. If I find any bugs or other issues I will let you know.

Hey, just wanted to say thank you for making this wonderful game! I'm going to play through it soon. 

Also, for any Linux users out there I was able to get it to start using Lutris with the following settings under Arch Linux (KDE DE) on my Librem 15 laptop:

1. Wine version: lutris-5.7-x86_64
2. DXVK off. (otherwise would crash immediately after launch)
3. Used winetricks to install vcrun6. (otherwise crash after input setup)
4. Set up separate wineprefix to keep things clean.

With these settings got through the first zone. Will test and report back with any issues.

Edit: Game version 1.07, also did not test gamepad input, just keyboard.

Edit#2: Tested an 8-bit do SN30 Pro+ gamepad (FW 4.01) connected through onboard bluetooth using Nintendo Switch mode (Y+START to turn on gamepad). Worked with no problem mapping buttons. 

Edit#3: Game works in either fullscreen or windowed mode. Was a bit laggy when maximized in windowed, but the Librem only has Intel HD Graphics 620, so a dedicated card would likely perform better. Did crash after switching between full and window a few times during gameplay. Left screen with low resolution after crash. Configure -> System options -> Restore resolution on exit in Lutris settings made the original resolution return the next time it crashed. So, just be careful toggling between the screen modes.