Rainbow Space Donkey Escape
You play as a rainbow space donkey, separated from your herd. Unfortunately you're in a part of space that's full of murderous evil Santas, who would like nothing more than to punch you in the nose. The aim is to make your way back to your herd without dying.
Complete with newtonian physics, a Binding of Isaac-style item system, and secret things.
[I find this one hard to go back to. The music loop's too short and repetitive, and I don't know what I was aiming for with the text, but whatever it was I did not hit the target - Niall in 2021]