Thank you, friend! I'll pass your words on to our artist right away.
About the results screen, the game has it at the end of the level. It just sends you to the main menu screen when you click any key. But the game has it and you can see more details there.
About the spamming. I don't think it's necessary to add a penalty, maybe some kind of cooldown to every button would be better.
(Sorry for bad english)