The controls were responsive to me! The tiles and the level design look nice! I liked how you made a difference between the play button and the exit button by size!

Suggestions:

• Use only one font family (or fonts that are so similar) and stick with it -- This would make the game look so much better than using different fonts that don't look good with each other, e.g. a serif font and a pixel font
• When the player finishes a level, display "Level Complete" and load the next level after one second or something -- This will improve the player feedback
• Display the number of the current level and total levels -- With this, I know what level I am in and how many levels left