Thanks a lot for playing through all the available difficulty modes and for the feedback! :) I’m really glad you enjoyed the game and its old-school arcade feel.
Different backgrounds and more customization options are great suggestions and definitely something worth considering for future updates.
There’s also a downloadable version available for both Windows and Linux, currently free as well, which includes all the game modes — including Madness and Custom.
Thanks again for taking the time to play and share your thoughts! :)