I feel the best way to prove an idea is by making a public rough sketch of what you plan on making. When the public demo’s released it will include no final artwork and will only resemble the rudiments of what you will be doing in the final game. The final game is planned to include a fully fleshed out story, voice acting, improved graphics and sound effects, and a more enjoyable HUD. Basically if when the demo comes out, if you like the concept, please stick with my while the final game goes through production ;)