I have a copy of Sapphire Safari. I surprised the devs by letting them know that their choice to make it in Unreal, has let me play the game in VR using UEVER. And no real need for them to do anything to make the game a VR game, of sorts, with UEVR available.
Is hard to compete or even match the success of others. Partly due to, no one ever truly knows the market. You could end up making a near clone of their game, and still not have their success, or you could do vastly better then them. Is hard to know what be a hit, or not.
I look forward to what you make next, be it 2d or 3D. I just hope that if you do get back into 3D someday, that you try giving this game another go.