Hey man!
Thanks for checking out the game.
I'm a MS Paint guy. So of course the eraser is just right-click.
But it seems that's a common issue for people. (Clearly they are to accustomed to fancy software, so they forgot their roots, which are and always will be MS Paint)
Some stages are meant to offer only downgrades. Pick the least hurtful!
Although I take this as a hint that I should communicate it better that that's the case.
Otherwise your suggestions are great! Thanks! <3