TL;DR
Deki Engine is an open-source, modular C++ game engine designed for embedded devices, particularly optimized for ESP32 platforms like the LilyGO T-Deck Plus and T-Display S3 AMOLED. It features a Unity-style visual editor that allows users to create 2D games by building scenes with sprites, text, and other elements, all while running at 60 frames per second on the ESP32-S3. The engine is available for both Windows and Linux, and its development can also be done on desktop through SDL3, which is useful for testing.