I used Godot and am rather new to the engine. I learned a ton: tweens, scene-changes, simple shader animations, tilemaps etc. :) ... ah yeah, and how to do a platformer in that engine.
Just a bit bummed out I didn't manage to submit, since the game-submission flow at itch confused me and this was my first jam.
If anyone wants to check it out anyway, here is the link: https://devdave.itch.io/there-and-back-viking-edition