@Riztro Perhaps using Trello @ www.trello.com could help you to put all the ideas or project you had in mind onto a board, and allow yourself to work on it in small steps. I have been using this for a while, heck it even helps me sort out what I need for baby stuff for the extra family member with my family!

Let this board give you a big picture of the game you had in mind about small cubes on one card, another card for texture with some ideas about it, another card for movement, of cubes, etc. This may help you without feeling overwhelming as I can sense in the questions you asking. The additional thing about Trello, it has some predefined lists to hold these cards into good meanful categories to be done, current work and done! piles.

If your ready about this game, you can enable sharing with other people later by inviting them to see what you have accomplished.

Hope this suggestion helps.
Peter.