Thank you so much for all the comments! Hearing people's feedback about all this is really valuable!
I wanted to construct the levels so that failing a jump would set you back too far, but this is definitely an area that needs some more tuning.
Thank you for going down the "Sorry" path! From a level design perspective, I wanted to have collectibles on both sides, but I wasn't sure how to to make them different, so I was hoping people would forgive me for trolling them just once. I play tested it on a couple friends, and they didn't even go that way, so I was a little bummed out.
All your comments are great, I really appreciate it! I think I was able to accomplish everything I could when I started this project a month ago, but I've learned a lot since then and I have a lot of ideas for the future! Thanks for playing to the end, you rock!!