Thanks for playing! Obstacles are a great idea! Another way to change up the levels, which I tried to implement but couldn't get working in time, is randomizing the position of the goal on level generation.
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That would be a great idea yes, but I understand you had a time crunch. I'm not a developer but I'm a friend of some participants and watching them work really surprised me with how much coding it takes to make a very small thing work. In my opinion congratulations are in order for anyone who submitted a working game in only four days! Good luck in the competition!