LIST OF 2018 GAMES ON SEGA CONSOLE
Where to get them (for physical) and download page (for ROM/ISO) on second post.
SEGA GENESIS / MEGADRIVE
January 09, 2018 - Astronauta Perdido (Lost Astronaut) *

January 13, 2018 - Return To Genesis *

January 14, 2018 - Zooming Secretary: Going Panic Demo *

January 21, 2018 - Rick Dangerous II *

January 22, 2018 - Picolades *

January 28, 2018 - Club Era's Pong *

February 03, 2018 - L'Abbaye des Morts (Rom version) *

February 07, 2018 - Mega 3D Noah's Ark

February 16, 2018 - 240p Test Suite

March 21, 2018 - Mega Marble World

March 25, 2018 - SEGA Genesis Test Cartridge

April 08, 2018 - Handy Harvy

April 09, 2018 - Mega Quadro Pong


May 03, 2018 - Dois Ciclopes (Two Cyclops) *

May 03, 2018 - Circus MD *

May 30, 2019 - Tag *

June 01, 2018 - Custodian

July 01, 2018 - Brave Battle Saga: The Legend of the Magic Warrior - Official Translation

July 28, 2018 - Griel's Quest for the Holy Porrón

August 08, 2018 - Little Medusa

August 14, 2018 - Tanglewood

August 14, 2018 - Rad Rhino *

August 18, 2018 - Escape 2042 (Rom version)

August 21, 2018 - 1985 Alternativo Mega Games

September 05, 2018 - Double Cooked

September 11, 2018 - Super Byoon *

September 15, 2018 - Generals of Yang Family (PAL packaging variant)
September 15, 2018 - Water Margin (PAL packaging variant)

October 09, 2018 - Virtua Worm 2 *

October 28, 2018 - Break an Egg *

October 29, 2018 - 30 Years of Nintendon't

November 03, 2018 - Cannon Fire Chaos!

November 05, 2018 - YM2612 Instrument Editor (Physical Version)

November 24, 2018 - L'Abbaye des Morts (Mega Cat Studios Variant)

December 15, 2018 - Magic Pockets


December 18, 2018 - Black Baron MD *

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SEGA GAME GEAR
August 10, 2018 - Grime Z80 *

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SEGA MASTER SYSTEM
January 01, 2018 - Silver Valley *

January 18, 2018 - Sokoban SMS *

March 17, 2018 - Prisonnier II *


March 27, 2018 - Astroswab *

March 27, 2018 - Galactic Revenge *


March 27, 2018 - Gemitas *


March 27, 2018 - Pico 8 *


March 27, 2018 - KATE *


March 28, 2018 - Simpson Trivia *


March 30, 2018 - Wah Munchers *


June 02, 2018 - XBill (SG-1000 game) *


August 10, 2018 - Grime Z80 *

November 30, 2018 - Flight Of Pigarus *


December 16, 2018 - Positorb *

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SEGA SATURN
December 31, 2018 - Asteroids Terra *

December 31, 2018 - Mazinger Z *

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SEGA DREAMCAST
January 05, 2018 - Dogma : The Golden Age Collection *

January 15, 2018 - Agartha *
(Previously Unreleased)

April 23, 2018 - Beat Em Shmup *

May 04, 2018 - Touhou Hagurumaden ~ Unfindable Connection *

May 16, 2022 - NvmU *

August 12, 2018 - HELP *

August 31, 2018 - Bang Busters

August 31, 2018 - Battle Crust

August 31, 2018 - Another World HD

August 31, 2018 - The Escapee

August 31, 2018 - Flashback 2 : Fade To Black

November 29, 2018 - Minesweeper *

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Note :
* ROM / ISO only, no physical cartridges / CDs.
If anyone knows more games that aren't on the list that coming up on 2018, please comment. I'll update it.
Here are links of a list for other new SEGA homebrew games
separated by years those games being finished :
2006-2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 WIP/TBA