Hey, thanks so much for taking the time to give such detailed feedback!
I agree that the main thing the game needs is new levels, (that's the most fun part of making the game for me). I have the story more or less planned out, and some completed tracks and art for some levels. What I want to figure out beforehand though is making the levels last longer, so I'm going to start working on that first. I have some ideas I want to try out.
The final plan is to build it into a game of around ~20 levels with over 1h of gameplay. But I haven't decided yet how I'm going to release this version. The plan is to finish it by the end of this year though!
Regarding the presentation, I was mainly interested in how people viewed the game before playing it, as I'm not sure how appealing/understandable the game is from the just screenshots videos. But I appreciate your thoughts on the in game presentation :)
Thanks again for your encouragement and I really appreciate you taking the time to give your feedback :)