Really cool game! Just make the controls make a bit more sense, Like to play a level you press space, but to go to the next level you have an arrow. It also doesn't help that there is no feed back when hovering over an option. Perhaps when hovering over the start button it changes tint lightly, and when you click it changes size slightly. You could also make the planet and void clickable to choose the option instead of having to press a button (keep the button presses but having multiple options is nice). I would also say make it more obvious on how to go to the next level. A check mark doesn't look like something your supposed to click to progress to the next level.
Thanks for the feedback! I know the controls are a little strange, I should have put size on the mouse wheel and just had the level automatically go on instead of the check mark. The planet and void are actually clickable, I didn't have the time to polish it up and have them give feedback when you moused over them, but it probably wouldn't have taken that long so I should have tried. I'll keep this in mind for my next game jam entry.