Or imagine this idea. Make a Sonic game in the style of an old fps boomershooter from Gearbox software in the style of Duke Nukem 3D on the Build engine. Powerslave Exhumed, Blood: Fresh Supply, Doom 64, Ion Fury. Except take out the fps hands overlay. All these games use 2D sprites in a 3D world. Like Doom. The sprites/enemies are flat 2D and rotate to the view of the player. Nightdive studios remakes all these types of boomer shooters and uses interpolation to make them super-smooth like 144 HZ, >60 fps. Basically Sonic would be in the center of the screen and the world moves around him in flat 2D sprites that rotate with the player. This could be a smaller-scope game that doesn't require a massive budget.