Hello and welcome to Feedback Quest 9! My name is Hythrain, and I'm one of the hosts for this lovely event! I'm also one of the streamers, so both the game and this feedback are being done live! If you want to see the see the VOD, let me know and I'll link you to it when it's uploaded to YouTube!
I find myself challenged to write an introduction to this. I've played similar styles of games in the past in Feedback Quest and have generally had a good time, but aspects of this one just... left me confused. The first level that this happened in was... ugh, my memory is bad... Developmental Something. It's where the moment you spawn, there's a gravity block right on you. The gravity block then will make you automatically fall down and to the right, where you hit a green block to unlock something. If you don't do anything, though, the ball will roll and die the moment it reaches the red block below the green one (even though technically it shouldn't as you should be sent away from it. This level I struggled to figure out the solution, instead janking my way through this first part by hitting the orange block that sends you rightward, then nudging myself down to hit another orange block that fixes gravity to go down. I'd then jump the moment i hit it and use the momentum in the air to let me get up and over the ice blocks. What made this weird, though, is that there's clearly another key block I can't reach if I do this, making me feel like I didn't do the solution right.
Then I got to the level after, called... Glorbbz's Revenge? Huh? Who the heck is Glorbbz? This level just stumped me because it feels like you can't do it. When you hit the key blocks, it causes gravity blocks to fall in your path. Not a big deal on the first one as you can jump the gap with ease. The same cannot be said for the second one, though, where jumping the gap is impossible. So I thought maybe I need to land on the gravity blocks and jump, but that didn't work either. In the end, I gave up here in frustration because I legitimately don't see how it's possible unless there's something in the gameplay that I've not discovered yet that you, as the developer, would know about.
When it comes to feedback to improve the game, I'm honestly unsure what to say. I'd like to see if that catching the corner of a red block while rolling along other, more prominent blocks didn't kill me, but that's about it. I also think it'd be better if the player was taught about each block organically instead of having to read a "how to play" to have an idea of what each one does. Lastly... I'll be honest I hate the sounds of a guy when I jump. I'm a marble, not a person. Why do I sound like a person?
This is all I can give you, unfortunately. I don't really have much without being able to experience more of the game.