A baby just wanting milk and crawling through an obby to get it is such a funny and original idea — NiteZero was right, it's genuinely amusing! The crawling animation getting called out by redkoala64 as a highlight says a lot, that kind of character personality goes a long way. For a first ever project AND first game jam at the same time, this is a really impressive start. Bl0ck head's checkpoint respawn fix is a great technical tip worth looking into, and adding a visual flash or sound when the checkpoint activates would make a big difference as Planet With a Ring suggested. The fall speed being a bit fast is a quick tweak that would immediately make the jumps feel more controlled. Keep going — most people never even finish and submit a game!
Feel free to check out my sky platformer too if you get a moment!