The contrast between the first and second stages was great, letting me learn how the character played and get to grip with the mechanics, then bringing on the pressure with the time-sensitive second stage. The difference in tone is great too!
Some nice visual touches on display, like the parallax scrolling between foreground and background to add a sense of depth, and the tiny and charming character sprites :)
There were only a couple of issues I found - coyote time, as suggested by Hiasae, would be really helpful for some of the trickier jumps, and there were a few moments where the camera would be just a little too high for me to see where I was aiming for my next jump. Nothing game breaking though!
Really fun little platformer, and a great first game :)
(as an aside, loved reading through your devlog - reminded me a lot of making my first games, and has some great points about the importance of playtesting!)