to be honest...
I belive this is your third game. Well heres 5 things to remind you to fix any future squel games base on this:
1. way to slow.
resolve: Speed it up a little not too much because player will fustraded at sensitivity.
2. no challenge.
resolve: To fix this, add a timer maybe as a option and add a leaderboader to the players time of how fast they can complete a level, of course if you can.
3. no menu
resolve: Like I said before put a challenge button and the basic buttons and your good to go.
4. too short
resolve: 20 level is a good amount.
5. no music
resolve: put some relaxing, music 5 choices of music is good.
overall this is a pretty good game just follow this steps. This is to help you in your future squel.