I almost left this game unplayed because I use ubuntu in my everyday pc. But the cover was so appealing that I entered an old win7 session just to play this game. Absolutely worth it, I must say!
What a round game. Amazing art, the lion sprite is simply stunning, the music and sound effects fit perfectly. It is a great use of the limitation, and the gameplay is really good, including different types of enemies, etc. Even the difficulty is really balanced, I struggle with the sword guys of round XII, and in the final phase, but the mechanic is rich enough to keep you playing, trying different strategies.
The only proposal that can come to mind is that, for this occasion or in others to come, you consider to upload an html5 version of the game (or/and a linux version), so more people can enjoy your work---which is great.