It would be really helpful if you could check out my project and give me tips or feedback on how I can make an awesome game like yours. (it's my first game jam). https://teckhybrid.itch.io/happybara. What's your secret ?
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As a dev on this game - Given the time constraints, it's important to have knowledge and experience of your engine's tools (i.e. physics, UI, input) beforehand so you don't have to learn during the jam. Having some general purpose code snippets on hand are also useful. Also, remember leave some time to playtest before submission.