Thank you for your feedback !
The key e was indeed intended for reducing the waiting, but you are right a quick skip key would probably have been better in that regards. For the macarena levels i was planning to add more visual and audio cues but didn't get enough times :/ But there is still patterns to be found and yes it s an act of balancing between the risks to miss because of the switch and ending quickly. (Spoiler for the patterns: In the first level the keys always swith in order up-> left -> down -> right. In the second level it switch randomly between clockwise and counter clockwise rotation but the up and down key will always transform in right left and vice versa. And in both level the switch is regular in times and the player highlight in green when it occurs)