Thanks for the amazing feedback!
1 - Will be in the next update. There will be 2 play buttons in the menu - Play(Level Select) and Speedrun which will start at the first bounce/bump on the first level and each time you hit the end trigger of the level the timer will stop, load the next level, and start back up.
2 - Restart button will most likely be R by default, but I am open to suggestions. The button will restart level for level mode and go back to level 1 for speedrun mode. No promises on keybinds currently, as I am planning on switching to Unity's new input system, but I will look into it.
3 - A next level button for level mode sounds pretty great. I will plan to add that in.
Level Editor - I might make the first 10 levels and then start work on this, we'll see though.
Customization - For sure something I want to add in the future, I do like the idea of completing the level to gain its colors.
I'm glad you mentioned it! It helps me understand what people want out of this game. I do want to keep the game as simple and fun as possible, but still maintain challenge. I might've gone a bit overboard on the wind out of excitement, but for future levels I will try to keep balance in mind.
Thank you again!