Lots of improvements! V 1.1

A lot of improvements have been made. Now the game should be less challenging at the start

ADDED

• Previously where was no quick way to delete wrong answers. Now pressing "ENTER" clears the current input!
• Now the math problems get harder over time.
• Previously you were able to solve multiple questions at once. This resulted in frustrating situations where a player accidentally answered a question right when not intended, and thus breaking the flow of the game. Now you can only solve the highlighted math question
• Now the lost game is more pronounced - the pitch of the music is lowered and a black overlay is added

OTHER FIXES/CHANGES

• The music volume was lowered
• The sound effect volume was lowered
• The multiplication sign was changed from  a star(*) to a dot
• The cameras shake was improved