My view on indie game dev. Start small then cut your idea in half. Then do that as game.
However, unreal does not go well with mobile games (apk file size is too much).
Currently doing some very simple rts game in space (really really simple), but this thing keeps growing.
My next game will be something small, but finding idea will be reversed:
- first find niche market (better be big fish in small pond than tiny fish in MMORPG_RTS_FPS_WITH_DINOSAURS_AND_JETPACKS)
- when i have such niche market that is starving for more gmaes (like VR game that does not make you dizzy) I will try to get idea.
So market/niche first then idea for tiny game.