Thank you for feedback! What exactly did you found unbalanced?
The difficulty spikes, especially from level 2 to 3, felt really steep in my opinion. Might as well be just my opinion of course :). I'd also add a restart button, by the way, not just an X to go to the menu.
Thanks for elaborating!That is some very good criticism.We have a restart button actually, but we forgot to tell players where to find it :D (It's R)