While writing your own engine from scratch can sound tempting, and absolutely is a rewarding excercise, if your goal is to publish a game, it's probably wise to not do this. Pick up gamemaker or godot or unity and start prototyping right away.

I might have a bit of a bias here, but I spend a not-insignificant amount of time on an online gamedev community, and the only people who ever finish anything are the guys using gamemaker and unity. Everyone else gets stuck at the "should I use regular inheritance or components/what's the best way to z-order sprites/Delta time coefficients cause random bugs in physics" stage and cannot proceed because their engine becomes unstable.

If you have the skills and time, and feel like it is necessary to write your own engine for your game, then by all means, but I think that for most people, these prerequisites don't exist.

"Real dev" or not, once you shipped your game, you've done more than most devs.

Sorry, but doing more work just for the sake of doing more work is not something that's impressive. It's merely a waste of time. For .kkrieger the technical achievement of fitting that much in so little space is definitely impressive, but dismissing developers that were using a licensed engine is pointless. Most games are built with finite time and money. If you can build a better game by allocating money somewhere you'd otherwise have spent time at the expense of part of the game, then that's a net win in my eyes, and doesn't diminish the result in the slightest.

Unless you believe that every single game should write its own engine from scratch, then I don't know what to say about that, it's just extremely obvious that it's not feasible for every project regardless of whether you have 100 or 10000 people working at your company.