Using different audio file type is a good workaround to dll, I believe you can check 'fmod.dll' to accomplish what you want to do though.
As far as fps is concerned, there are a huge number of tricks you can use to speed up the processing and the display of your game.
What is sure is that displaying 9 sprites for 9 ennemies + one sprite for your character + 5-6 bombs for a total of less than 20 sprite can run at 60 fps very easily even on not so great machine. The main trick being to not use while loop but to /tokenize a list of items and use $*.
Feel free to stop by the channel in my signature to talk about this.
Implementing multiple player shouldn't add a new loop to your code anyway and shouldn't make it slower, the only problem is fighting the lag!
COOL bro! I will try to figure out about all these tips! Thanks verymuch!!! Btw, Im recording some videos about the progress im doing with this game... CHeck it here if you want
https://www.youtube.com/playlist?list=PL6qKC6q_P5msf-tBZkFASvarrzFzGGs12
