Very inspiring game! I liked it!
Suggestions:
- Add a countdown timer, or just a timer. (To show the players how much time, did they spent on the level)
- Add a main menu.
- Add a pause menu.
Great work! Keep making games, and never give up!
Now I know why I didn't saw the timer! I didnt saw it because I wasn't playing in fullscreen, and the game was like this:

Game in full screen:

(To switch a windowed game to fullscreen in windows, just click on the game view, then "Alt + Enter" and it will become fullscreen, some games won't be fullscreen)