Thank you for your feedback, Emzizl! Could you elaborate a little bit on why it was difficult? Was it the controls on the keyboard you didn't find convenient or are you talking about the actual difficulty of the levels of the game itself? On the difficulty, did you try to have Infinite Lives enabled to be easier? If the keyboard arrows were an issue, it's possible to use a gamepad with a small tool like Joytokey for PC so that you can map the left/right arrows to the D-pad and down arrow to the X button for instance. It may be more comfortable this way... A next version will have native support for gamepad, as well as a Web version.
On my end I have downloaded the file, but unfortunately I won't be able to test the game until I come back from my leave.