The engine used to build this game was a once-off creation, designed explicitly to run this particular title. This is not a _real_ game engine, this is a generic category.
How to proceduraly generate a huge 2D universe in real time.
This article describes the process of making OpenTomb sources work within Code::Blocks development environment.
Graphics and conceptual development process of final game art and sprites. Look Reactor Heart's pixel art process !!