Engineering game with physical gear ratio, pistons etc.
Abandon reason: After completion of the global direct solver, turns out it wasn't actually fun at all.

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Foliage fast-bake lighting system (using approximate shape definitions to gather shadows). I want to revisit this one day
Abandon reason: Couldnt scale it to full open worlds

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Mini moon voyager - A dynamic terrain space exploration game. Not much was completed
Abandon Reason: Scope too large for 1 person

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Carve - A game about riding a trolley down hill. Believe it or not this exact code bacame Skate Rift.
Abandon reason: The simulation was becoming too sophisticated for a joke game