Yes they are indeed lifes. They are different shapes since it felt really bland having them be just pentagons.

I had actually used only two hours for this version of the game (and 1 hour for a 3d prototype which didn't turn out as well) so technically I had one hour left which I could have used for the music. It does work well with certain pieces of classical music, e.g. "In The Steppes of Central Asia" by A. Borodin.

Thanks for the feedback!

Some background music would have definitely been nice; I should probably try to do that in later editions of the jam. :)

Sorry about not being able to close the window on Linux. I went a bit trigger-happy with the confined mouse mode, without giving an easy way out. You can close the window using Alt-F4 or by focusing another window and then clicking with the game's window's close button directly.