Not sure if Wonder Boy: Dragon's Trap could really be considered Sega. They published the original game, but it doesn't look like they have anything to do with this one.
Yup, it's developed by Lizard Cube and published by DotEmu.
That's why I put it on "Others" / SEGA's Legacy section, which are for games not made by SEGA but worth looking into since it's connected to SEGA in some way,
along with Monster Boy, Toejam and Earl: Back To The Groove, Shenmue 3, Superdimension Neptune vs SEGA Hard Girl, and Project X Zone 2.