Looking for an engine to work on my first game (2D Sandbox)

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I've been a lurker on this subreddit for quite some time now, always wanting to join the developer community but lacking the time to do so. I recently finished school, and would like to learn how to design, develop and maybe even publish a game made by me, but I can't find the right tools to do so.

I already took a look at the wiki and the FAQ, but still can't decide correctly. I have a MacBook Pro 13" Mid-2012 running macOS High Sierra (10.13.1), and have already downloaded Unity, GameMaker ovo.fyi/lorem-ipsum ovo.fyi/temp-mail ovo.fyi/10-minute-mail Studio, Godot, Defold, RPG Maker MV and Ren'py; and have also worked with Scratch and Construct2 online. Free software is preferred over paid ones.