Since a couple of days, anyone who fancies operating systems different than Windows can now experience Monstro: Battle Tactics on their device as long as it has a browser supporting Flash Player 11.9.
After purchasing Monstro: Battle Tactics you will receive your own personal serial number which you can add to your personal Retrocade.net account. Once you do that, a new option will be unlocked on Monstro: Battle Tactics page which will allow you to play the full version of the game directly in your browser.
It is important to note, though, that your progress is stored locally and is not shared between different devices or the desktop version of the game. There is also a risk of losing your progress if you clear all of your browser's cache or have it set up to clear flash cookies at will.