Glad you enjoyed! This was my first time ever drawing humanoid characters or doing character sprites for a game, so I found it quite a tricky and slow process. I got halfway through a proper Ollie animation before I had to stop because it was taking up too much of my time and I still had to do course design and environmental art. I definitely need to get some more practice in before the next jam.
Main tip if you want to get higher ranks is to make sure you get all the sticker spots! The game is quite forgiving of a few mistakes if you have all the stickers (2000 points just from having them all), so my advice is to not focus on those and spend a lot of time grinding, which should net you an Amazing rank.