I used mostly raw JS with the only library being modified Processing JS. I did all the physics by myself I think. No game engine used once so ever which should be pretty impressive. Though in the core of the game code there is a sort of "engine" that runs it. Also I wouldn't look there if I were you since I had to put most of hit in one file due to the library's limitations so it's a really big mess. The game works though (well for the most part)
PS: I'm making a 3rd game. This was basically Planet Search 2 so I'm making Planet Search 3. It's only in the early stages of development and it will take years to make. But you can check it out on my Github. My username is prolight14 not prolightHub on Github.
Helix's Adventure is a game I made, where you get to explore the planet of Amber, recover the lost crystals, by completing dungeons and fighting bosses. There are 3.5 worlds to play, with 100+ levels, 100+ game objects. There is plenty of room for adventure here and don't forget to collect gems.
I hope you enjoy this platformer and also note that this is a continuation of my previous game planet search. So here is the game as you expected: https://prolighthub.itch.io/helixs-adventure
Oh and remember its a pretty long adventure and it should prove to be a new experience for some of you.
