Thank you very much, I'm glad you enjoyed it! I think you have the highest score so far.
The engine used is called Maraton and it's my custom-built engine.
Viewing post in Just Let Me Code jam comments
Right now it is still a closed source engine but I plan on making it available here on itch.io sometime soon!
Yeah making your engine is difficult and you have to set aside a lot of time before you can reap the benefits. I'd recommend developing one subsystem at a time to not get overwhelmed, If you ever get stuck or have questions I'd be happy to lend a hand!