Aw, sorry to hear that, I struggled with making the levels difficult enough that you can't really get through them by just playing random notes but not so difficult/restrictive that they only allow for one solution or require overly precise timing.
Yes, you have the right idea for level 2, that's one way to beat it and that's the solution I had in mind when designing the level*. Unfortunately the physics engine kind of does what it wants so it's difficult to totally accommodate the player, but it is definitely possible to solve the level this way with the right notes and the right timing. But seeing as nobody got past level 2 in the live demo I think this level was just misdesigned.
There's actually only one other level, I have sketches for a fourth level (I planned to do four originally) but I needed to spend an entire day figuring out how to get the game running on the web with threads and a Rust Godot extension so I didn't have time to implement it. I plan to fine tune the mechanics and add more levels after the jam though. I posted a walkthrough video in the Discord anyway if you want to see the final level.
* Spoiler: You can also beat it by getting the player on the opposite side and playing a note that repels you from both at the same time, that gives you enough of a boost to get to the exit.