Idea 1:

A survival-based 2D platformer where you play as a lone explorer stranded on a deserted island. The goal is to gather resources, build shelter, and ultimately find a way off the island before time runs out. Each day presents new challenges such as hostile wildlife, changing weather conditions, and diminishing resources. Players must strategize and adapt their survival tactics to overcome these obstacles. As the game progresses, they can discover hidden caves, ancient ruins, and even encounter other survivors with their own agendas. The key to success lies in balancing exploration, resource management, and risk-taking.

Controls would involve keyboard inputs for movement, actions, and inventory management, while mouse clicks could be used for interactions with objects and environments.

One potential challenge in developing this game would be creating a dynamic environment that responds realistically to player actions and external factors such as weather and time of day.

Idea 2:

A time-traveling puzzle-adventure game set in a whimsical steampunk world. Players take on the role of a brilliant inventor who accidentally invents a time machine and must navigate through different historical periods to collect lost pieces of their invention scattered across time. Each level represents a distinct era, from ancient civilizations to futuristic metropolises, each with its own unique puzzles and challenges. To progress, players must solve puzzles, interact with historical figures, and outsmart obstacles using a combination of wit, creativity, and a touch of mad science.

Controls would involve both keyboard inputs for movement and actions, as well as mouse clicks for interacting with objects and solving puzzles.

A potential obstacle in developing this game would be creating diverse and historically accurate environments while maintaining a cohesive art style throughout different time periods. Additionally, implementing time-travel mechanics and ensuring puzzle complexity without becoming overly frustrating would require careful design and testing.