- 1 project manager / year.
- 1 game designer / year.
- 1-2 programmer / year.
- 2-3 months month of sound design / music.
- 3-5 artists / year.
Even if you have a great multi-skill team you need at least 5-6 people for a 6-9-12 months and it's would be very much skeleton crew.
There are cases where team of 1-3 people working part-time without funding can build a great game, but it's require both sticking to specific genres and greater use of ready-to-use assets which means it must be 3D. Game that small indie company will build in 6 month will take 3-6 years with a team working part-time.
Indie devs who self publishing only target PC because commercial porting sertvices cost starting from $10,000-15,000 per platform and it's gonna be way more expensive if game wasnt optimized for gamepad and big screens from beginning. And it's just impractical to port it yourself because it will take many months to pass certifications since know-how for proprietary platforms is not available on stack overflow.
I sure it's possible to get $100,000 of budget for a new game as team of 5 people to release it within 6-12 moinths. Even without much of track record it's doable if you have cool prototype. But I pretty certain no one will ever give money to yet unknown solo developer to release the same game in 2-3 years.
Yet modern tools become better and better every year and even for $100-500 you can buy enough of assets to build something that look good enough in 3D. There are just certain genres and art styles that just require larger team.
When you do pixel art you cant just buy bunch of art packs and expect them to work together. And for anything high-quality you'll be creating all the art from scratch for every project.
Of course I not talking about very basic 8-bit stuff, but about something that is actually looks good and well animated.