Feels way too short for me to have any real opinion about this game 😕
Though you said you only had 30 hours to make this game, and I assume that includes time for sleeping, eating, and doing everything else, so yeah it's understandable.
Also there's this really cool "feature" I found in your game that I'm not sure if you actually intended it. You can jump when hugging into walls, which means that you don't even need the extra "feature" to reach the secret checkpoint in level 2, 3, and 4.