I'm sorry to hear that you couldn't progress beyond level 2...
Could I know what's preventing you from completing it ?
Have you pressed "Esc" to restart the level and thoroughly explored both dimensions to catch the power-ups ?
Maybe consider giving it another try with this little assistance to see if it becomes easier...
As for the additional controls, I chose to keep the same keys but with a double press ( for double jump and dash ) to avoid adding three new keys to learn and also to make it more accessible for those playing on their phones, ensuring there aren't too many buttons obscuring the level ( and they can also double tap the buttons on the touchscreen to simulate a double press on the keyboard ).